Moh'd Al-Nimr - Academia.edu (original) (raw)
Papers by Moh'd Al-Nimr
International Journal of Thermophysics, 2000
The thermal behavior of a two-layered thin slab carrying periodic signals under the effect of the... more The thermal behavior of a two-layered thin slab carrying periodic signals under the effect of the dual-phase-lag heat conduction model is investigated. Two types of periodic signals are considered, a periodic heating source and a periodic imposed temperature at the boundary. The deviations among the predictions of the classical diffusion model, the wave mode, and the dual-phase-lag model are investigated. Analytical closed-form solutions are obtained for the temperature distribution within the slab. The effect of the angular frequency, thickness of the plate, dimensionless thermal relaxation time, dimensionless phase-lag in temperature gradient, thermal conductivity, and thermal diffusivity on the temperature distribution of the slab was studied. It is found that the deviations among the three models increase as the frequency of the signals increases and as the thickness of the plate decreases. It is found that the use of the dual-phase-lag heat conduction model is necessary when the metal film thickness is of order 10 −6 m and the angular frequency of the signals is of order 10 12 rad · s −1 .
Heat and Mass Transfer, 2002
The conjugated transient forced convection heat transfer for laminar, thermally developing, stead... more The conjugated transient forced convection heat transfer for laminar, thermally developing, steady slug flow of a Newtonian fluid of constant thermal properties in semi-infinite pipes and ducts is considered. An analytical solution for three cases, namely (1) steady state, (2) transient with negligible axial conduction in the wall and (3) early stages of time, is obtained.
International Journal of Thermophysics, 2000
The major objective of this work is to describe the dynamic thermal behavior of thermoelectric ge... more The major objective of this work is to describe the dynamic thermal behavior of thermoelectric generators and refrigerators under the effect of the hyperbolic heat conduction model. In practical situations, these devices work under transient operating conditions due to the time change in the imposed current, voltage, and hot or cold temperatures. Results for transient temperature distributions were obtained for different parameters. The coefficient of performance was obtained as a function of time for increasing current flow.
Heat Transfer Engineering, 2008
... Tariq Darabseh a , Malak Naji a & Moh'D Al-Nimr a pages 632-642. ... Abd-All... more ... Tariq Darabseh a , Malak Naji a & Moh'D Al-Nimr a pages 632-642. ... Abd-Alla [1212. Abd-Alla, AM 1995. Thermal Stress in a Transversely Isotropic Circular Cylinder Due to an Instantaneous Heat Source. Applied Mathematics and Computation , vol. 68: 113124. ...
Journal of Fluids Engineering, 2009
JSME International Journal Series B, 2002
432 Superconductors Thermal Stability under the Effect of the Hyperbolic Heat Conduction Model* M... more 432 Superconductors Thermal Stability under the Effect of the Hyperbolic Heat Conduction Model* Moh'd Ahmad Al-NIMR**, Moh'd Qasim ODAT*** and Moh'd HAMDAN**** The superconductor thermal stability is investigated under the effect of the hyperbolic heat conduction model. ...
The validity of using the microscopic hyperbolic heat conduction model under a harmonic fluctuati... more The validity of using the microscopic hyperbolic heat conduction model under a harmonic fluctuating boundary heating source is investigated. It is found that using the microscopic hyperbolic heat conduction model is essential when w Cl G > 0.1. The phase shift between the electron-gas and solid-lattice temperatures is found to be tan −1 ( w Cl G ). This phase shift reaches a fixed value of 1.5708 rad at very large values of w Cl G . It is found that the use of the microscopic hyperbolic heat conduction model is essential when w > 1 × 10 9 rad · s −1 for most metallic layers independent of their thickness.
International Journal of Thermophysics, 2002
This work studies the heat transfer mechanisms during rapid heating of two-layer composite thin s... more This work studies the heat transfer mechanisms during rapid heating of two-layer composite thin slabs from a macroscopic point of view using the hyperbolic heat conduction model. The composite slabs consist of two thin metal layers which may be in perfect or imperfect thermal contact. The effects of parameters such as the two films' thickness ratio, thermal conductivity ratio, heat
Japanese Journal of Applied Physics, 2003
Page 1. Thermal Stability of Anisotropic Superconducting Wires/Cylinders under the Effect of Dual... more Page 1. Thermal Stability of Anisotropic Superconducting Wires/Cylinders under the Effect of Dual-Phase-Lag Heat Conduction Model Mohammed Qassim AL-ODAT Ć and Moh'd Ahmad AL-NIMR 1y Mechanical Engineering ...
Japanese Journal of Applied Physics, 2000
... Model Suhail KIWAN and Moh'd Ahmad AL-NIMR Mechanical Engineering Department, Jordan Uni... more ... Model Suhail KIWAN and Moh'd Ahmad AL-NIMR Mechanical Engineering Department, Jordan University of Science and Technology, Irbid, Jordan (Received November 8, 1999; accepted for publication April 24, 2000) The ...
International Journal of Heat and Mass Transfer, 2004
The transient hydrodynamics behavior of the non-Newtonian fluid flow in horizontal parallel-plate... more The transient hydrodynamics behavior of the non-Newtonian fluid flow in horizontal parallel-plate channels filled with porous medium is investigated numerically. The role of the macroscopic local inertial term in the porous domain momentum equation is studied. It is found that the macroscopic local inertial term has insignificant effect on the channel hydrodynamics behavior for all non-Newtonian fluids having power law index less than 0.5 and over the entire range of Darcy and Forchheimer numbers. However, the macroscopic local inertial term has significant effect when the power law index is greater than 1 over a wide range of Darcy and Forchheimer numbers especially for relatively high values of Darcy and low values of Forchheimer numbers. It is found that the effect of the macroscopic local inertial term is very sensitive to the Forchheimer number at high values of Darcy numbers and power law index. Also, there is an upper limit for n beyond which changing the power law index has insignificant effect on the local inertial term.
International Journal of Energy Research, 1998
A simple perturbation technique is used to reformulate the energy equations which describe the tr... more A simple perturbation technique is used to reformulate the energy equations which describe the treatment thermal behaviour of a radially lumped conjugate that transfer problem is annular and dissimilar parallel plate ducts of finite wall thickness. The simplified perturbation tecnique is used to eliminate the coupling between the fluid and the solid-wall energy equations when the temperature difference between the fluid and the solid-wall is a small perturbed quantity, which is true when the interface convective heat transfer coefficient between the fluid and the solid-wall is high.
Energy, 2011
This book is one of few books that cover most of the renewable energy resources. The adopted trea... more This book is one of few books that cover most of the renewable energy resources. The adopted treatment in this book is comprehensive in the sense that it covers the fundamental, physical, theoretical, mathematical, technological, economical and environmental aspects and features of each renewable energy resource."
Energy, 2010
... Thermodynamics and Stochastic Theory of Nonlinear Systems Far From Equilibrium by W. Ebeling ... more ... Thermodynamics and Stochastic Theory of Nonlinear Systems Far From Equilibrium by W. Ebeling & L. Schimansky-Geier Vol ... Marie Hansen, Torleif Holt, Isabella Inzoli, Eivind Johannessen, Einar Eng Johnsen, Gelein de Koeijer, Lars Nummedal, Anne-Kristine Meland, Steffen ...
Energy, 2011
The authors succeeded in convincing the readers that adopting renewable energy to replace the con... more The authors succeeded in convincing the readers that adopting renewable energy to replace the conventional resources is a must and it can be done easily. The book presents a detailed map to attain this goal. The book describes the past and present situations and this may be not a difficult task but it predicts the future and the authors, in my opinion, succeeded in this challenge."
Energy, 2011
Solar ponds provide the most convenient and least expensive option for heat storage for daily and... more Solar ponds provide the most convenient and least expensive option for heat storage for daily and seasonal cycles. This is particularly important for a desalination facility, if steady and constant water production is required. If, in addition to high storage capacity, other favorable conditions exist, the salt gradient solar ponds (SGSPs) are expected to be able to carry the entire load of a large-scale flash desalination plants without dependence upon supplementary sources. This paper presents a performance investigation of a SGSP coupled with desalination plant under Jordanian climatic conditions. This is particularly convenient in the Dead Sea region characterized by high solar radiation intensities, high ambient temperature most of the year, and by the availability of high concentration brine. It was found that a 3000 m 2 solar pond installed near the Dead Sea is able to provide an annual average production rate of 4.3 L min À1 distilled water compared with 3.3 L min À1 that would be produced by El Paso solar pond, which has the same surface area. Based on this study, solar ponds appear to be a feasible and an appropriate technology for water desalination near the Dead Sea in Jordan.
Applied Thermal Engineering, 1999
A mathematical model describing the performance of a modi®ed Australian cooling system is present... more A mathematical model describing the performance of a modi®ed Australian cooling system is presented. The modi®ed Australian cooling system is a night cold storage system enhanced by radiative cooling. The working¯uid in the modi®ed cooling system is cooled by passing the¯uid through a radiative cooling panel which cools itself by long-wave thermal radiation to the cold sky temperature. An analytical, closed form solution is presented which predicts the temperature response of the modi®ed system. The analytical solutions are veri®ed experimentally, where it is found that both theoretical and experimental results are in a good agreement. #
Microsystem Technologies, 2010
In this paper numerical solution was provided for the 2D, axisymmetric Navier-Stokes equations co... more In this paper numerical solution was provided for the 2D, axisymmetric Navier-Stokes equations coupled with energy equation for gaseous slip flow between two micro rotating disks pump. A first-order slip boundary condition was applied to all internal solid walls. The objective is to study the effect of Knudsen number, rotational Reynolds number and gap height on pump head, flow rate,
Journal of Fluids Engineering, 2010
ABSTRACT
A new design of a wind water heater (WWH) is presented. In this new system, the wind energy is di... more A new design of a wind water heater (WWH) is presented. In this new system, the wind energy is directly converted to thermal energy used to heat the water. The wind energy is converted to frictional thermal energy by dissipation within a thin layer of oil. The oil is filled in an annular gap confined between two horizontal concentric cylinders with different diameters; the outer insulating cylinder is rotating while the inner cylinder is fixed. The heat generated is transferred into the inner cylinder then to the heat exchanger. The heat transfer fluid is carrying the heat from the heat exchanger to the water storage tank by mechanical pump. A mathematical model is proposed to model the system mechanical and thermal behavior. The theoretical model has been solved analytically to estimate the amount of thermal energy generated by the system based on a given wind design speed at the site. The theoretical performance of the proposed heater is analyzed and the effects of different design parameters on the heater performance are investigated. The theoretical predictions of the system performance show that the efficiency of proposed wind water heater at design wind speed is equal to 34.8%. The relatively low conversion efficiency of kinetic wind energy to sensible thermal one is due to the limitation imposed by the windmill performance.
International Journal of Thermophysics, 2000
The thermal behavior of a two-layered thin slab carrying periodic signals under the effect of the... more The thermal behavior of a two-layered thin slab carrying periodic signals under the effect of the dual-phase-lag heat conduction model is investigated. Two types of periodic signals are considered, a periodic heating source and a periodic imposed temperature at the boundary. The deviations among the predictions of the classical diffusion model, the wave mode, and the dual-phase-lag model are investigated. Analytical closed-form solutions are obtained for the temperature distribution within the slab. The effect of the angular frequency, thickness of the plate, dimensionless thermal relaxation time, dimensionless phase-lag in temperature gradient, thermal conductivity, and thermal diffusivity on the temperature distribution of the slab was studied. It is found that the deviations among the three models increase as the frequency of the signals increases and as the thickness of the plate decreases. It is found that the use of the dual-phase-lag heat conduction model is necessary when the metal film thickness is of order 10 −6 m and the angular frequency of the signals is of order 10 12 rad · s −1 .
Heat and Mass Transfer, 2002
The conjugated transient forced convection heat transfer for laminar, thermally developing, stead... more The conjugated transient forced convection heat transfer for laminar, thermally developing, steady slug flow of a Newtonian fluid of constant thermal properties in semi-infinite pipes and ducts is considered. An analytical solution for three cases, namely (1) steady state, (2) transient with negligible axial conduction in the wall and (3) early stages of time, is obtained.
International Journal of Thermophysics, 2000
The major objective of this work is to describe the dynamic thermal behavior of thermoelectric ge... more The major objective of this work is to describe the dynamic thermal behavior of thermoelectric generators and refrigerators under the effect of the hyperbolic heat conduction model. In practical situations, these devices work under transient operating conditions due to the time change in the imposed current, voltage, and hot or cold temperatures. Results for transient temperature distributions were obtained for different parameters. The coefficient of performance was obtained as a function of time for increasing current flow.
Heat Transfer Engineering, 2008
... Tariq Darabseh a , Malak Naji a & Moh'D Al-Nimr a pages 632-642. ... Abd-All... more ... Tariq Darabseh a , Malak Naji a & Moh'D Al-Nimr a pages 632-642. ... Abd-Alla [1212. Abd-Alla, AM 1995. Thermal Stress in a Transversely Isotropic Circular Cylinder Due to an Instantaneous Heat Source. Applied Mathematics and Computation , vol. 68: 113124. ...
Journal of Fluids Engineering, 2009
JSME International Journal Series B, 2002
432 Superconductors Thermal Stability under the Effect of the Hyperbolic Heat Conduction Model* M... more 432 Superconductors Thermal Stability under the Effect of the Hyperbolic Heat Conduction Model* Moh'd Ahmad Al-NIMR**, Moh'd Qasim ODAT*** and Moh'd HAMDAN**** The superconductor thermal stability is investigated under the effect of the hyperbolic heat conduction model. ...
The validity of using the microscopic hyperbolic heat conduction model under a harmonic fluctuati... more The validity of using the microscopic hyperbolic heat conduction model under a harmonic fluctuating boundary heating source is investigated. It is found that using the microscopic hyperbolic heat conduction model is essential when w Cl G > 0.1. The phase shift between the electron-gas and solid-lattice temperatures is found to be tan −1 ( w Cl G ). This phase shift reaches a fixed value of 1.5708 rad at very large values of w Cl G . It is found that the use of the microscopic hyperbolic heat conduction model is essential when w > 1 × 10 9 rad · s −1 for most metallic layers independent of their thickness.
International Journal of Thermophysics, 2002
This work studies the heat transfer mechanisms during rapid heating of two-layer composite thin s... more This work studies the heat transfer mechanisms during rapid heating of two-layer composite thin slabs from a macroscopic point of view using the hyperbolic heat conduction model. The composite slabs consist of two thin metal layers which may be in perfect or imperfect thermal contact. The effects of parameters such as the two films' thickness ratio, thermal conductivity ratio, heat
Japanese Journal of Applied Physics, 2003
Page 1. Thermal Stability of Anisotropic Superconducting Wires/Cylinders under the Effect of Dual... more Page 1. Thermal Stability of Anisotropic Superconducting Wires/Cylinders under the Effect of Dual-Phase-Lag Heat Conduction Model Mohammed Qassim AL-ODAT Ć and Moh'd Ahmad AL-NIMR 1y Mechanical Engineering ...
Japanese Journal of Applied Physics, 2000
... Model Suhail KIWAN and Moh'd Ahmad AL-NIMR Mechanical Engineering Department, Jordan Uni... more ... Model Suhail KIWAN and Moh'd Ahmad AL-NIMR Mechanical Engineering Department, Jordan University of Science and Technology, Irbid, Jordan (Received November 8, 1999; accepted for publication April 24, 2000) The ...
International Journal of Heat and Mass Transfer, 2004
The transient hydrodynamics behavior of the non-Newtonian fluid flow in horizontal parallel-plate... more The transient hydrodynamics behavior of the non-Newtonian fluid flow in horizontal parallel-plate channels filled with porous medium is investigated numerically. The role of the macroscopic local inertial term in the porous domain momentum equation is studied. It is found that the macroscopic local inertial term has insignificant effect on the channel hydrodynamics behavior for all non-Newtonian fluids having power law index less than 0.5 and over the entire range of Darcy and Forchheimer numbers. However, the macroscopic local inertial term has significant effect when the power law index is greater than 1 over a wide range of Darcy and Forchheimer numbers especially for relatively high values of Darcy and low values of Forchheimer numbers. It is found that the effect of the macroscopic local inertial term is very sensitive to the Forchheimer number at high values of Darcy numbers and power law index. Also, there is an upper limit for n beyond which changing the power law index has insignificant effect on the local inertial term.
International Journal of Energy Research, 1998
A simple perturbation technique is used to reformulate the energy equations which describe the tr... more A simple perturbation technique is used to reformulate the energy equations which describe the treatment thermal behaviour of a radially lumped conjugate that transfer problem is annular and dissimilar parallel plate ducts of finite wall thickness. The simplified perturbation tecnique is used to eliminate the coupling between the fluid and the solid-wall energy equations when the temperature difference between the fluid and the solid-wall is a small perturbed quantity, which is true when the interface convective heat transfer coefficient between the fluid and the solid-wall is high.
Energy, 2011
This book is one of few books that cover most of the renewable energy resources. The adopted trea... more This book is one of few books that cover most of the renewable energy resources. The adopted treatment in this book is comprehensive in the sense that it covers the fundamental, physical, theoretical, mathematical, technological, economical and environmental aspects and features of each renewable energy resource."
Energy, 2010
... Thermodynamics and Stochastic Theory of Nonlinear Systems Far From Equilibrium by W. Ebeling ... more ... Thermodynamics and Stochastic Theory of Nonlinear Systems Far From Equilibrium by W. Ebeling & L. Schimansky-Geier Vol ... Marie Hansen, Torleif Holt, Isabella Inzoli, Eivind Johannessen, Einar Eng Johnsen, Gelein de Koeijer, Lars Nummedal, Anne-Kristine Meland, Steffen ...
Energy, 2011
The authors succeeded in convincing the readers that adopting renewable energy to replace the con... more The authors succeeded in convincing the readers that adopting renewable energy to replace the conventional resources is a must and it can be done easily. The book presents a detailed map to attain this goal. The book describes the past and present situations and this may be not a difficult task but it predicts the future and the authors, in my opinion, succeeded in this challenge."
Energy, 2011
Solar ponds provide the most convenient and least expensive option for heat storage for daily and... more Solar ponds provide the most convenient and least expensive option for heat storage for daily and seasonal cycles. This is particularly important for a desalination facility, if steady and constant water production is required. If, in addition to high storage capacity, other favorable conditions exist, the salt gradient solar ponds (SGSPs) are expected to be able to carry the entire load of a large-scale flash desalination plants without dependence upon supplementary sources. This paper presents a performance investigation of a SGSP coupled with desalination plant under Jordanian climatic conditions. This is particularly convenient in the Dead Sea region characterized by high solar radiation intensities, high ambient temperature most of the year, and by the availability of high concentration brine. It was found that a 3000 m 2 solar pond installed near the Dead Sea is able to provide an annual average production rate of 4.3 L min À1 distilled water compared with 3.3 L min À1 that would be produced by El Paso solar pond, which has the same surface area. Based on this study, solar ponds appear to be a feasible and an appropriate technology for water desalination near the Dead Sea in Jordan.
Applied Thermal Engineering, 1999
A mathematical model describing the performance of a modi®ed Australian cooling system is present... more A mathematical model describing the performance of a modi®ed Australian cooling system is presented. The modi®ed Australian cooling system is a night cold storage system enhanced by radiative cooling. The working¯uid in the modi®ed cooling system is cooled by passing the¯uid through a radiative cooling panel which cools itself by long-wave thermal radiation to the cold sky temperature. An analytical, closed form solution is presented which predicts the temperature response of the modi®ed system. The analytical solutions are veri®ed experimentally, where it is found that both theoretical and experimental results are in a good agreement. #
Microsystem Technologies, 2010
In this paper numerical solution was provided for the 2D, axisymmetric Navier-Stokes equations co... more In this paper numerical solution was provided for the 2D, axisymmetric Navier-Stokes equations coupled with energy equation for gaseous slip flow between two micro rotating disks pump. A first-order slip boundary condition was applied to all internal solid walls. The objective is to study the effect of Knudsen number, rotational Reynolds number and gap height on pump head, flow rate,
Journal of Fluids Engineering, 2010
ABSTRACT
A new design of a wind water heater (WWH) is presented. In this new system, the wind energy is di... more A new design of a wind water heater (WWH) is presented. In this new system, the wind energy is directly converted to thermal energy used to heat the water. The wind energy is converted to frictional thermal energy by dissipation within a thin layer of oil. The oil is filled in an annular gap confined between two horizontal concentric cylinders with different diameters; the outer insulating cylinder is rotating while the inner cylinder is fixed. The heat generated is transferred into the inner cylinder then to the heat exchanger. The heat transfer fluid is carrying the heat from the heat exchanger to the water storage tank by mechanical pump. A mathematical model is proposed to model the system mechanical and thermal behavior. The theoretical model has been solved analytically to estimate the amount of thermal energy generated by the system based on a given wind design speed at the site. The theoretical performance of the proposed heater is analyzed and the effects of different design parameters on the heater performance are investigated. The theoretical predictions of the system performance show that the efficiency of proposed wind water heater at design wind speed is equal to 34.8%. The relatively low conversion efficiency of kinetic wind energy to sensible thermal one is due to the limitation imposed by the windmill performance.