Performance of a Heat Exchanger Based on Enhanced Heat Diffusion in Fluids by Oscillation: Analysis

1990 ◽  
Vol 112 (1) ◽  
pp. 49-55 ◽  
Author(s):  
M. Kaviany
Keyword(s):  
Heat Transfer ◽  
Boundary Layer Thickness ◽  
Oscillatory Flow ◽  
Heat Diffusion ◽  
Tube Radius ◽  
Flow And Heat Transfer ◽  
Oscillation Analysis ◽  
Different Temperatures ◽  
Fluid Particles

Fluid flow and heat transfer in capillary tubes (Stokes’ boundary-layer thickness nearly equal to the tube radius), subject to oscillatory flow from two reservoirs maintained at different temperatures, has been analyzed. Extension of existing analysis has been made by allowing for finite wall thickness and estimating the viscous dissipation. For a bundle of tubes connected to reservoirs of finite volume, analysis is also made of the oscillatory motion in the reservoirs (assuming a piston-type displacement within the reservoirs). The effects of various fluid and tube parameters on the heat transfer in a single tube are examined. The pathlines followed by fluid particles show that the extent of interaction between the fluid exiting the bundle and the fluid in the reservoirs (or the heat transfer surfaces in the reservoirs) depends strongly on the radial position of the exiting fluid particles. In a follow-up paper, these predictions are compared with some experimental results.

A Model of 90 Degree Turn Oscillatory Flow and Heat Transfer

2003 ◽  
Author(s):  
Mounir Ibrahim ◽  
Zhiguo Zhang ◽  
Sundeep Kembhavi ◽  
Terrence Simon ◽  
Roy Tew ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Oscillatory Flow ◽  
Flow And Heat Transfer

Passive Heat Transfer in Porous Enclosures Using a Two-Energy Equation Model

2012 ◽  
Author(s):  
Marcelo J. S. deLemos ◽  
Paulo H. S. Carvalho
Keyword(s):  
Heat Transfer ◽  
Energy Equation ◽  
Equation Model ◽  
Thermal Conductivity Ratio ◽  
Governing Equations ◽  
Flow And Heat Transfer ◽  
Energy Models ◽  
Different Temperatures ◽  
Volume Method ◽  
Generalized Coordinate

This paper presents computations for natural convection within a porous cavity filled with a fluid saturated permeable medium. The finite volume method in a generalized coordinate system is applied. The walls are maintained at constant but different temperatures, while the horizontal walls are kept insulated. Governing equations are written in terms of primitive variables and are recast into a general form. Flow and heat transfer characteristics are investigated for two energy models and distinct solid-to-fluid thermal conductivity ratio.

scholarly journals Influence of electrical-conductivity of walls on magnetohydrodynamic flow and heat transfer of micropolar fluid

2018 ◽  
Vol 22 (Suppl. 5) ◽  
pp. 1591-1600 ◽  
Author(s):  
Milos Kocic ◽  
M. Zivojin-Stamenkovic ◽  
Jelena Petrovic ◽  
Milica Nikodijevic
Keyword(s):  
Heat Transfer ◽  
Electrical Conductivity ◽  
Micropolar Fluid ◽  
Coupling Parameter ◽  
Temperature Fields ◽  
Closed Form Solutions ◽  
Electrically Conducting ◽  
Viscosity Parameter ◽  
Flow And Heat Transfer ◽  
Different Temperatures

In this paper, flow and heat transfer in a horizontal channel with isothermal walls has been investigated. The upper and lower plate have been kept at the two constant different temperatures, micropolar fluid is electrically conducting, while the channel plates have arbitrary electrical-conductivity. Applied magnetic field is perpendicular to the flow and the full MHD model is investigated. The general equations that describe the discussed problem under the adopted assumptions are reduced to ODE and closed-form solutions are obtained. The profiles of velocity, microrotation, induced magnetic and temperature fields in function of electrical-conductivity and the coupling parameter and the spin-gradient viscosity parameter together with electrical-conductivity, are graphically shown and discussed.

Liquid-Vapor Oscillating Flow and Heat Transfer in a U-Shaped Minichannel With Internal Wick Structure

2009 ◽  
Author(s):  
Jiajun Xu ◽  
Yuwen Zhang ◽  
H. B. Ma
Keyword(s):  
Heat Transfer ◽  
Oscillatory Flow ◽  
Oscillating Flow ◽  
Transfer Coefficients ◽  
Oscillating Heat Pipe ◽  
Heat Transfer Coefficients ◽  
Evaporation And Condensation ◽  
Flow And Heat Transfer ◽  
Wick Structure ◽  
Liquid Vapor

Liquid-vapor oscillating flow and heat transfer in a vertically placed oscillating heat pipe (OHP) with a sintered particle wick structure inside are analyzed in this paper. The evaporation and condensation heat transfer coefficients are obtained by solving the microfilm evaporation and condensation on the sintered particles. The sensible heat transfer between the liquid slug and the channel wall are obtained by analytical solution or empirical correlations, depending on whether the liquid flow is laminar or turbulent. The effects of the maximum evaporation and condensation angles on the oscillatory flow, as well as sensible and latent heat transfer are analyzed.

A Numerical Study of Flow and Heat Transfer Between Two Rotating Spheres With Time-Dependent Angular Velocities

2008 ◽  
Vol 130 (7) ◽  
Author(s):  
Ali Jabari Moghadam ◽  
Asghar Baradaran Rahimi
Keyword(s):  
Heat Transfer ◽  
Viscous Incompressible Fluid ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Heat Transfer Characteristics ◽  
Coriolis Forces ◽  
Flow And Heat Transfer ◽  
Concentric Spheres ◽  
Different Temperatures ◽  
Angular Velocities

The transient motion and the heat transfer of a viscous incompressible fluid contained between two vertically eccentric spheres maintained at different temperatures and rotating about a common axis with different angular velocities are numerically considered when the angular velocities are arbitrary functions of time. The resulting flow pattern, temperature distribution, and heat transfer characteristics are presented for the various cases including exponential and sinusoidal angular velocities. Long delays in heat transfer of large portions of the fluid in the annulus are observed because of the angular velocities of the corresponding spheres. As the eccentricity increases and the gap between the spheres decreases, the Coriolis forces and convection heat transfer effect in the narrower portion increase. Special results for concentric spheres are obtained by letting eccentricity tends to zero.

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