Akira Nakayama - Profile on Academia.edu (original) (raw)

Papers by Akira Nakayama

A Porous Media Approach for Bifurcating Flow and Mass Transfer in a Human Lung

Journal of Heat Transfer, 2009

Journal of Thermal Science, 2007

An overall two-dimensional numerical model of the miniature flat plate capillary pumped loop (CPL... more An overall two-dimensional numerical model of the miniature flat plate capillary pumped loop (CPL) evaporator is developed to describe the liquid and vapor flow, heat transfer and phase change in the porous wick structure, liquid flow and heat transfer in the compensation cavity and heat transfer in the vapor grooves and metallic wall.

A Similarity Solution for Free Convection From a Point Heat Source Embedded in a Non-Newtonian Fluid-Saturated Porous Medium

J Heat Transfer, 1993

Warme Und Stoffubertragung, 1987

The K~trman-Pohlhausen integral procedure was exploited to solve the problem of free convection f... more The K~trman-Pohlhausen integral procedure was exploited to solve the problem of free convection from a vertical heated surface imbedded in a thermally stratified porous medium. Upon considering the Darcy law, the energy integral relation, and the auxiliary relation associated with the curvature of the temperature profile at the wall, a closed-form expression for the Nusselt number was reduced for the case where the distributions of the wall temperature and ambient temperature vary according to power-functions of distance. Results on an isothermal plate are found to be in close agreement with those from the exact solution. Effects of the thermal stratification on local heat transfer rates are also discussed.

Comment on “The Nakayama-Koyama approach to laminar forced convection heat transfer to power-law fluids,” by H. I. Andersson

Int J Heat Fluid Flow, 1989

Approximate solution for non-darcy transient film condensation in a porous medium

Revista Brasileira De Ciencias Mecanicas Journal of the Brazilian Society of Mechanical Sciences, Mar 1, 1998

A Unified Theory for Non-Darcy Free, Forced, and Mixed Convection Problems Associated With a Horizontal Line Heat Source in a Porous Medium

Journal of Heat Transfer, May 1, 1994

We propose a unified integral treatment for the non-Darcy mixed convection in the plume rising fr... more We propose a unified integral treatment for the non-Darcy mixed convection in the plume rising from a line heat source, along the lines of Nakayama and Pop (1991). From the proposed flow regime map, one can readily find out which convection mode is realized for given conditions, and then select the appropriate set of solutions to describe the corresponding velocity and temperature fields.

A quasi-three-dimensional numerical calculation procedure for periodically fully-developed heat and fluid flow

International Journal of Numerical Methods For Heat and Fluid Flow, Jun 1, 2005

Fluid Flow and Heat Transfer Within Ducts of a Cross-Shaped Cross-Section : 2nd Report, Numerical Calculation of Turbulent Flow Field : Fluids Engineering, Heat Transfer, Combustion, Power, Thermophysical Properties

Jsme International Journal Bulletin of the Jsme, 1987

Flow Turbul Combust, 1994

The non-similar problems associated with a non-isothermal vertical flat plate embedded in a fluid... more The non-similar problems associated with a non-isothermal vertical flat plate embedded in a fluid-saturated porous medium were considered to assess the performances of the two distinctive boundary layer solution methods, namely, the local similarity solution and the integral method, The results generated from these two approximate solution methods are compared against the results from a two-point finite difference and those based on a Merk-type series expansion. Comparison of the results reveals that both integral and local similarity methods perform excellently. Especially, the accuracy acquired by the local similarity solution is so high that the difference between the results from the local similarity solution and those from the two-point finite difference and local non-similarity solution methods is hardly discernible for the case of monotonic increasing wall temperature. Subscripts e 213 = stream function = ambient = wall A. NAKAYAMA AND M.A. HOSSAIN

An integral procedure for a two-phase boundary layer in laminar film condensation

International Journal of Multiphase Flow, 1986

Free convection from a cone with a closed end

Letters in Heat and Mass Transfer, 1982

An integral method in laminar film condensation on plane and axisymmetric bodies

Letters in Heat and Mass Transfer, 1982

Free Convection around a Heated Fin Embedded in a Thermally Stratified Porous Medium : Series B : Fluid Engineering, Heat Transfer, Combustion, Power, Thermophysical Properties

Jsme International Journal Bulletin of the Jsme, May 1, 1987

Three dimensional flow within conduits of arbitrary geometrical configurations

Ph D Thesis Illinois Univ Urbana Champaign, 1981

A general elliptic calculation scheme was developed along with a three dimensional transformation... more A general elliptic calculation scheme was developed along with a three dimensional transformation procedure for arbitrary nonorthogonal coordinate systems, for the purpose of predicting the three dimensional turbulent flows within ducts of arbitrary geometrical configurations. After the completion of the calculations on the various test flow cases the laminar developing flows in square and triangular ducts (the laminar separated flow in a constricted circular tube as well as the fully developed turbulent flow in a square, rectangular, and trapezoidal ducts) this elliptic scheme was employed for the calculations of the three dimensional developing turbulent flows in square duct with two equation (k and epsilon) model coupled to the algebraic stress model. The predicted results were extensively compared with two sets of experimental data as well as the calculations by the parabolic marching procedure, with strong emphasis on the local structure of turbulence.

Subcooled forced convection film boiling over a vertical flat plate embedded in a fluid-saturated porous medium

Warme Und Stoffubertragung, Aug 31, 1988

Subcooled forced convection film boiling over a vertical flat plate embedded in a fluid-saturated... more Subcooled forced convection film boiling over a vertical flat plate embedded in a fluid-saturated porous medium

Numerical prediction of turbulent flow and heat transfer within ducts of cross-shaped cross section

Journal of Heat Transfer, Nov 1, 1986

ABSTRACT

Flow Turbul Combust, 1993

Transient non-Darcy free convection between two parallel vertical plates in a fluid saturated por... more Transient non-Darcy free convection between two parallel vertical plates in a fluid saturated porous medium is investigated using the generalized momentum equation proposed by Vafai and Tien. The effects of porous inertia and solid boundary are considered in addition to the Darcy flow resistance. Exact solutions are found for the asymptotic states at small and large times. The large time solutions reveal that the velocity profiles are rather sensitive to the Darcy number Da when Da < 1. It has also been found that boundary friction alters the velocity distribution near the wall, considerably. Finite difference calculations have also been carried out to investigate the transient behaviour at the intermediate times in which no similarity solutions are possible. This analytical and numerical study reveals that the transient free convection between the parallel plates may well be described by matching the two distinct asymptotic solutions obtained at small and large times.

Buoyancy-induced flow of non-Newtonian fluids over a non-isothermal body of arbitrary shape in a fluid-saturated porous medium

Applied Scientific Research, 1991

The buoyancy-induced flows of non-Newtonian fluids over non-isothermal bodies of arbitrary shape ... more The buoyancy-induced flows of non-Newtonian fluids over non-isothermal bodies of arbitrary shape within saturated porous media have been treated using the boundary layer approximations and the power-law model to characterize the non-Newtonian fluid behavior. Upon introducing a general similarity transformation which considers both the geometrical effect and the wall temperature effect on the development of the boundary layer length scale,

A note on the confusion associated with the interfacial heat transfer coefficient for forced convection in porous media

International Journal of Heat and Mass Transfer, Dec 1, 2014

This note is provided to clear away possible confusion associated with the correlation proposed b... more This note is provided to clear away possible confusion associated with the correlation proposed by Kuwahara et al. (2001) [1] for the interfacial heat transfer coefficient for forced convection in porous media.

A Porous Media Approach for Bifurcating Flow and Mass Transfer in a Human Lung

Journal of Heat Transfer, 2009

Journal of Thermal Science, 2007

An overall two-dimensional numerical model of the miniature flat plate capillary pumped loop (CPL... more An overall two-dimensional numerical model of the miniature flat plate capillary pumped loop (CPL) evaporator is developed to describe the liquid and vapor flow, heat transfer and phase change in the porous wick structure, liquid flow and heat transfer in the compensation cavity and heat transfer in the vapor grooves and metallic wall.

A Similarity Solution for Free Convection From a Point Heat Source Embedded in a Non-Newtonian Fluid-Saturated Porous Medium

J Heat Transfer, 1993

Warme Und Stoffubertragung, 1987

The K~trman-Pohlhausen integral procedure was exploited to solve the problem of free convection f... more The K~trman-Pohlhausen integral procedure was exploited to solve the problem of free convection from a vertical heated surface imbedded in a thermally stratified porous medium. Upon considering the Darcy law, the energy integral relation, and the auxiliary relation associated with the curvature of the temperature profile at the wall, a closed-form expression for the Nusselt number was reduced for the case where the distributions of the wall temperature and ambient temperature vary according to power-functions of distance. Results on an isothermal plate are found to be in close agreement with those from the exact solution. Effects of the thermal stratification on local heat transfer rates are also discussed.

Comment on “The Nakayama-Koyama approach to laminar forced convection heat transfer to power-law fluids,” by H. I. Andersson

Int J Heat Fluid Flow, 1989

Approximate solution for non-darcy transient film condensation in a porous medium

Revista Brasileira De Ciencias Mecanicas Journal of the Brazilian Society of Mechanical Sciences, Mar 1, 1998

A Unified Theory for Non-Darcy Free, Forced, and Mixed Convection Problems Associated With a Horizontal Line Heat Source in a Porous Medium

Journal of Heat Transfer, May 1, 1994

We propose a unified integral treatment for the non-Darcy mixed convection in the plume rising fr... more We propose a unified integral treatment for the non-Darcy mixed convection in the plume rising from a line heat source, along the lines of Nakayama and Pop (1991). From the proposed flow regime map, one can readily find out which convection mode is realized for given conditions, and then select the appropriate set of solutions to describe the corresponding velocity and temperature fields.

A quasi-three-dimensional numerical calculation procedure for periodically fully-developed heat and fluid flow

International Journal of Numerical Methods For Heat and Fluid Flow, Jun 1, 2005

Fluid Flow and Heat Transfer Within Ducts of a Cross-Shaped Cross-Section : 2nd Report, Numerical Calculation of Turbulent Flow Field : Fluids Engineering, Heat Transfer, Combustion, Power, Thermophysical Properties

Jsme International Journal Bulletin of the Jsme, 1987

Flow Turbul Combust, 1994

The non-similar problems associated with a non-isothermal vertical flat plate embedded in a fluid... more The non-similar problems associated with a non-isothermal vertical flat plate embedded in a fluid-saturated porous medium were considered to assess the performances of the two distinctive boundary layer solution methods, namely, the local similarity solution and the integral method, The results generated from these two approximate solution methods are compared against the results from a two-point finite difference and those based on a Merk-type series expansion. Comparison of the results reveals that both integral and local similarity methods perform excellently. Especially, the accuracy acquired by the local similarity solution is so high that the difference between the results from the local similarity solution and those from the two-point finite difference and local non-similarity solution methods is hardly discernible for the case of monotonic increasing wall temperature. Subscripts e 213 = stream function = ambient = wall A. NAKAYAMA AND M.A. HOSSAIN

An integral procedure for a two-phase boundary layer in laminar film condensation

International Journal of Multiphase Flow, 1986

Free convection from a cone with a closed end

Letters in Heat and Mass Transfer, 1982

An integral method in laminar film condensation on plane and axisymmetric bodies

Letters in Heat and Mass Transfer, 1982

Free Convection around a Heated Fin Embedded in a Thermally Stratified Porous Medium : Series B : Fluid Engineering, Heat Transfer, Combustion, Power, Thermophysical Properties

Jsme International Journal Bulletin of the Jsme, May 1, 1987

Three dimensional flow within conduits of arbitrary geometrical configurations

Ph D Thesis Illinois Univ Urbana Champaign, 1981

A general elliptic calculation scheme was developed along with a three dimensional transformation... more A general elliptic calculation scheme was developed along with a three dimensional transformation procedure for arbitrary nonorthogonal coordinate systems, for the purpose of predicting the three dimensional turbulent flows within ducts of arbitrary geometrical configurations. After the completion of the calculations on the various test flow cases the laminar developing flows in square and triangular ducts (the laminar separated flow in a constricted circular tube as well as the fully developed turbulent flow in a square, rectangular, and trapezoidal ducts) this elliptic scheme was employed for the calculations of the three dimensional developing turbulent flows in square duct with two equation (k and epsilon) model coupled to the algebraic stress model. The predicted results were extensively compared with two sets of experimental data as well as the calculations by the parabolic marching procedure, with strong emphasis on the local structure of turbulence.

Subcooled forced convection film boiling over a vertical flat plate embedded in a fluid-saturated porous medium

Warme Und Stoffubertragung, Aug 31, 1988

Subcooled forced convection film boiling over a vertical flat plate embedded in a fluid-saturated... more Subcooled forced convection film boiling over a vertical flat plate embedded in a fluid-saturated porous medium

Numerical prediction of turbulent flow and heat transfer within ducts of cross-shaped cross section

Journal of Heat Transfer, Nov 1, 1986

ABSTRACT

Flow Turbul Combust, 1993

Transient non-Darcy free convection between two parallel vertical plates in a fluid saturated por... more Transient non-Darcy free convection between two parallel vertical plates in a fluid saturated porous medium is investigated using the generalized momentum equation proposed by Vafai and Tien. The effects of porous inertia and solid boundary are considered in addition to the Darcy flow resistance. Exact solutions are found for the asymptotic states at small and large times. The large time solutions reveal that the velocity profiles are rather sensitive to the Darcy number Da when Da < 1. It has also been found that boundary friction alters the velocity distribution near the wall, considerably. Finite difference calculations have also been carried out to investigate the transient behaviour at the intermediate times in which no similarity solutions are possible. This analytical and numerical study reveals that the transient free convection between the parallel plates may well be described by matching the two distinct asymptotic solutions obtained at small and large times.

Buoyancy-induced flow of non-Newtonian fluids over a non-isothermal body of arbitrary shape in a fluid-saturated porous medium

Applied Scientific Research, 1991

The buoyancy-induced flows of non-Newtonian fluids over non-isothermal bodies of arbitrary shape ... more The buoyancy-induced flows of non-Newtonian fluids over non-isothermal bodies of arbitrary shape within saturated porous media have been treated using the boundary layer approximations and the power-law model to characterize the non-Newtonian fluid behavior. Upon introducing a general similarity transformation which considers both the geometrical effect and the wall temperature effect on the development of the boundary layer length scale,

A note on the confusion associated with the interfacial heat transfer coefficient for forced convection in porous media

International Journal of Heat and Mass Transfer, Dec 1, 2014

This note is provided to clear away possible confusion associated with the correlation proposed b... more This note is provided to clear away possible confusion associated with the correlation proposed by Kuwahara et al. (2001) [1] for the interfacial heat transfer coefficient for forced convection in porous media.