Analysing the Thermal Performance of Heat Pipe Using Copper Nanofluids (original) (raw)
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Thermal performance of cylindrical heat pipe using nanofluids
Journal of thermophysics …, 2010
Acylindrical copper heat pipe with a 19.5mmouter diameter and a 400.0mmlength was filled with three different working fluids and tested for different heat inputs in the range of 100–250 W. The working fluids tested were de-ionized water, silver–water colloid, and copper water. Experimental results showed that the wall temperature reduction obtained was 3–27C. The efficiency of the heat pipe was enhanced by 14% as compared with the heat pipe filled with the base fluid. Furthermore, it was found that an increase in the metal fraction in copper–water nanofluids lead to enhancement in thermal efficiency of the heat pipe. Thermal conductivities of copper–water nanofluids were measured, showing a 30% enhancement with a 0.1 wt%of copper nanoparticles.
The Experimental Study of the Thermal Performance of Heat Pipe using CuO/Water Nanofluid.
International Journal of Engineering Sciences & Research Technology, 2013
This paper presents the enhancement of the thermal performance of a heat pipe charged with nanofluid. The CuO/Water nanofluid served as the working fluid with three concentrations by volume 1g/L, 5g/L and 10g/L in heat pipe. The heat pipe is fabricated by a straight copper tube with an outer diameter 18 mm, thickness 1mm and length of 475 mm. This paper presents a discussion on the effect of various performing parameters by varying different heat inputs as well as fluid concentration as mentioned above. The nanoparticles have observed significant effect on the enhancement of thermal performance of heat pipe by increasing fluid concentration as well as different heat inputs. Experimental results show that at a heating power of 80 W, the optimal thermal conductivity and heat transfer rate for CuO/Water nanofluid heat pipe are 50.46% and 1.75% respectively, which are better than that of pipes using pure water as the working fluid. Nomenclature: dx: Thickness (m) dT: Temperature difference ( 0C ) k: Thermal conductivity [W/m K] R HP : Total thermal resistance (ᶿC/W) A s : Surface Area (m 2 ) V HP : Total Volume of heat pipe (L) D: Outer diameter (m) t: Thickness (m) k HP : Overall thermal conductivity of heat pipe (W/m 0 C) L: Length of the heat pipe (m) Qin: Heat transfer rate (heating power) (W) V: Voltage (V)
Thermal performance of screen mesh wick heat pipes using water-based copper nanofluids
Applied Thermal Engineering, 2012
h i g h l i g h t s < Cuedistilled nanofluids display thermal conductivity enhancement of w15% at 30 C. < Thermal performance of heat pipes containing screen mesh wick is investigated. < Effect of nanoparticle concentration and heat pipe inclination are studied. < Evaporatorecondenser thermal resistance is reduced by w27% for vertical heat pipe.
A comprehensive study of the performance of a heat pipe by using of various nanofluids
Science Direct, 2017
In this paper, a two-dimensional numerical model is developed to simulate the performance of a heat pipe using various nanofluids. The effect of different nanofluids (prepared using alumina, copper oxide, and silver nanoparticles) at different concentrations and particle diameters on the performance of heat pipe is also studied by through finite volume method. The obtained results show that using a nanofluid instead of water leads to the increased thermal efficiency and reduction in heat at wall of the heat pipe. Also, the temperature difference between the evaporator and the condenser is a function of input power; this means that by an increase in the input capacity, the temperature difference between the evaporator and the condenser increases. It was observed that the use of nanofluid reduces the axial-flow pressure of the fluid inside the wick. As a result, the transmission of fluid flow inside the wick from the condenser to the evaporator is easily done with the cost of using a nanofluid. Moreover, with an increase in thermal capacity, fluid pressure drop becomes maximum and thus temperature difference between the evapora-tor and the condenser increases.
Thermal Performance of a cylindrical heat pipe using nano fluids
A cylindrical copper heat pipe with a 19.5 mm outer diameter and a 400.0 mm length was filled with three different working fluids and tested for different heat inputs in the range of 100-250 W. The working fluids tested were de-ionized water, silver-water colloid, and copper water. Experimental results showed that the wall temperature reduction obtained was 3-27 C. The efficiency of the heat pipe was enhanced by 14% as compared with the heat pipe filled with the base fluid. Furthermore, it was found that an increase in the metal fraction in copper-water nanofluids lead to enhancement in thermal efficiency of the heat pipe. Thermal conductivities of copper-water nanofluids were measured, showing a 30% enhancement with a 0.1 wt % of copper nanoparticles.
Effect of Nanofluid Concentration on the Performance of Circular Heat Pipe
The goal of this paper is to experimentally study the behavior of nanofluid to improve the performance of a circular heat pipe. Pure water and Al2O3-water based nanofluid are used as working fluids. An experimental setup is designed and constructed to study the heat pipe performance under different operating conditions. The effect of filling ratio, volume fraction of nano-particle in the base fluid, and heat input rate on the thermal resistance is investigated. Total thermal resistance of the heat pipe for pure water and Al2O3-water based nanofluid is also predicted. An experimental correlation is obtained to predict the influence of Prandtl number and dimensionless heat transfer rate, Kq on thermal resistance. Thermal resistance decreases with increasing Al2O3-water based nanofluid compared to that of pure water. The experimental data is compared to the available data from previous work. The agreement is found to be fairly good.
An investigation of the thermal performance of cylindrical heat pipes using nanofluids
… Journal of Heat and Mass Transfer, 2010
In this work, a two-dimensional analysis is used to study the thermal performance of a cylindrical heat pipe utilizing nanofluids. Three of the most common nanoparticles, namely Al 2 O 3 , CuO, and TiO 2 are considered as the working fluid. A substantial change in the heat pipe thermal resistance, temperature distribution, and maximum capillary heat transfer of the heat pipe is observed when using a nanofluid. The nanoparticles within the liquid enhance the thermal performance of the heat pipe by reducing the thermal resistance while enhancing the maximum heat load it can carry. The existence of an optimum mass concentration for nanoparticles in maximizing the heat transfer limit is established. The effect of particle size on the thermal performance of the heat pipe is also investigated. It is found that smaller particles have a more pronounced effect on the temperature gradient along the heat pipe.
INVESTIGATION ON THERMAL PERFORMANCE OF HEAT PIPE USING NANOFLUID: A REVIEW
IJAERD, 2018
Nanofluids have been the subject of intensive study worldwide since pioneering researchers recently discovered the anomalous thermal behaviour of these fluids. Comprehensive research work on heat transfer in heat pipe using nanofluids have been experimentally and theoretically investigated in recent years by various researchers. The suspended nanoparticles effectively enhance the heat transfer characteristics and the transport properties of base fluids in heat pipes. The objective of this paper is to present an overview of literature dealing with influence of various factors such as heat pipe tilt angle, charged amount of working fluid, nanoparticle type, size and concentration, mass/ volume fraction & its effect on the thermal efficiency, heat transfer capacity & reduction in thermal resistance.
Heat Transfer Enhancement in Heat Pipe Using Nanofluid – A Review
— For enhancement of heat transfer in heat pipe, Nano fluid found vital role and a new frontier in various engineering applications. This paper reviews and summarizes the work on heat pipes using nano fluids as a working medium. Various types of nano particle with different base fluids as proved its potential to improve thermal properties of working medium in heat pipe. The effect of filling ratio, volume fraction of nano practices on thermal performance in various kinds of heat pipe with different base fluids under various operating conditions has been discussed. Mechanism of enhancement of heat transfer after utilization of nano fluids in heat pipe has been explained. Also, influence of dimensionless on thermal resistance in terms of correlation has been studied. This paper discusses relativity of total heat resistance between the heat pipe with nano fluid and with existing fluids. Focusing towards the application this paper suggests the suitability of heat pipes in various heat generation problems.
In industries such as power generation, chemical production, air conditioning, transportation, and microelectronics the cconventional heat transfer fluids such as water, mineral oil, and ethylene glycol are used to transfer heat from one fluid to another. The low thermal conductivity of conventional fluids increase the size of the heat transfer device for the given heat transfer. So there is a need to develop energy-efficient heat transfer fluids that are required in a plethora of heat transfer applications. Modern materials technology provided the opportunity to produce nanometer-sized particles which are quite different from the parent material in mechanical, thermal, electrical, and optical properties. The heat transfer properties of these conventional fluids can be significantly enhanced by dispersing nanometer-sized solid particles such as Al 2 O 3 , Cu, CuO and Fe 2 O 3. The suspended nano-sized metallic and metal oxide particles change the transport properties and heat transfer characteristics of the base fluid. Thus the preparation of nanofluids using metal and metal oxide nanoparticleswill play an important role in developing the next generation of cooling technology. The CuO nanoparticles are prepared by adopting sol-gel techniquein the present work. The CuO nanoparticles are prepared from copper nitrate by passed it through different stages such as dissolving, preparation of solution, formation of gel, filtration and drying to get the nano-sized CuO particles. The nanoparticles are sintered for 3 hours at a temperature of 200 0 C in the furnace to remove the liquid traces completely from nanoparticles. TheCuO-water nanofluids are prepared at different volumetric concentration of CuO nanoparticle in the base fluid. To find the heat transfer rates of CuO-water nanofluid for different Reynolds numbers and for different volume fractions of nano-particles in the base fluidthe experiments are conducted in a double pipe counter flow heat exchanger. The experimental overall heat transfer coefficients calculated are compared with the base fluid water. Also the theoretical overall heat transfer coefficients of CuO-water nanofluid are determined by evaluating the physical and thermal properties of nanofluid with the correlations available in the literature.