Measurements of convective and radiative heat transfer rates and skin friction in hot, non-adiabatic, turbulent flows

1979 ◽  
Author(s):  
A. GADOR ◽  
J. LOUIS
Keyword(s):  
Heat Transfer ◽  
Skin Friction ◽  
Turbulent Flows ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Transfer Rates

scholarly journals MHD natural convection flow with radiative heat transfer past an impulsively moving vertical plate with ramped temperature in the presence of hall current and thermal diffusion

2013 ◽  
Vol 18 (4) ◽  
pp. 1201-1220
Author(s):  
G.S. Seth ◽  
G.K. Mahato ◽  
S. Sarkar
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Skin Friction ◽  
Radiative Heat Transfer ◽  
Vertical Plate ◽  
Radiative Heat ◽  
Hall Current ◽  
Convection Flow ◽  
Natural Convection Flow ◽  
Flow Parameters

Abstract An investigation on an unsteady MHD natural convection flow with radiative heat transfer of a viscous, incompressible, electrically conducting and optically thick fluid past an impulsively moving vertical plate with ramped temperature in a porous medium in the presence of a Hall current and thermal diffusion is carried out. An exact solution of momentum and energy equations, under Boussinesq and Rosseland approximations, is obtained in a closed form by the Laplace transform technique for both ramped temperature and isothermal plates. Expressions for the skin friction and Nusselt number for both ramped temperature and isothermal plates are also derived. The numerical values of fluid velocity and fluid temperature are displayed graphically versus the boundary layer coordinate y for various values of pertinent flow parameters for both ramped temperature and isothermal plates. The numerical values of the skin friction due to primary and secondary flows are presented in tabular form for various values of pertinent flow parameters.

scholarly journals INCORPORATION OF A TWO-FLUX MODEL FOR RADIATIVE HEAT TRANSFER IN A COMPREHENSIVE FLUIDIZED BED SIMULATOR PART II: NUMERICAL RESULTS AND ASSESSMENT

2003 ◽  
Vol 2 (2) ◽  
pp. 49
Author(s):  
J. A. Rabi ◽  
M. L. De Souza-Santos
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Fluidized Bed Reactors ◽  
Transfer Model ◽  
New Developments ◽  
Transfer Rates ◽  
Gas Phases ◽  
Flux Model

As shown in the first part of this paper, equations and considerations for a preliminary attempt to improve the treatment for radiative heat transfer of a previous comprehensive simulation program were presented. For that, the two-flux radiative heat transfer model was applied. In this second part, the new version of that program was tested against steady-state operations of real equipment. Numerical simulations were carried for two different fluidized-bed reactors: a coal-fed boiler and a wood-fed gasifier. Computational results obtained with that new version were compared with those obtained with the previous simulator version. Then, both sets of results were also compared with real operational data. Special attention was paid to the temperature profiles of each particle species present in the bed section – carbonaceous, limestone and inert – as well as to the radiative heat transfer rates between these solids. Effects on the temperature profiles of the gas phases – emulsion and bubbles – and on the equipment performance parameters were also investigated. Improvements related to the incorporation of two-flux model are assessed and discussed. New developments and extensions of this approach are indicated.

scholarly journals Analysis of radiative heat transfer impact in cross-flow tube and fin heat exchangers

2016 ◽  
Vol 37 (1) ◽  
pp. 99-112
Author(s):  
Małgorzata Hanuszkiewicz-Drapała ◽  
Tomasz Bury ◽  
Katarzyna Widziewicz
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Cross Flow ◽  
Infrared Camera ◽  
Test Facility ◽  
Main Element ◽  
Flow Tube ◽  
Transfer Rates

AbstractA cross-flow, tube and fin heat exchanger of the water – air type is the subject of the analysis. The analysis had experimental and computational form and was aimed for evaluation of radiative heat transfer impact on the heat exchanger performance. The main element of the test facility was an enlarged recurrent segment of the heat exchanger under consideration. The main results of measurements are heat transfer rates, as well as temperature distributions on the surface of the first fin obtained by using the infrared camera. The experimental results have been next compared to computational ones coming from a numerical model of the test station. The model has been elaborated using computational fluid dynamics software. The computations have been accomplished for two cases: without radiative heat transfer and taking this phenomenon into account. Evaluation of the radiative heat transfer impact in considered system has been done by comparing all the received results.

scholarly journals A Note on Radiative Heat Transfer to Peristaltic Flow of Sisko Fluid

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Obaid Ullah Mehmood ◽  
Constantin Fetecau
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Viscous Fluid ◽  
Skin Friction ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Shear Thickening ◽  
Sisko Fluid ◽  
Highly Nonlinear ◽  
Axial Pressure Gradient

This paper looks at the effects of radiative heat transfer on the peristaltic transport of a Sisko fluid in an asymmetric channel with nonuniform wall temperatures. Adopting the lubrication theory, highly nonlinear coupled governing equations involving power law index as an exponent have been linearized and perturbation solutions are obtained about the Sisko fluid parameter. Analytical solutions for the stream function, axial pressure gradient, axial velocity, skin friction, and Nusselt number are derived for three different cases (i.e., shear thinning fluid, viscous fluid, and shear thickening fluid). The effects of Grashof number, radiation parameter, and other configuration parameters on pumping, trapping, temperature, Nusselt number, and skin friction have been examined in detail. A good agreement has been found for the case of viscous fluid with existing results.

scholarly journals INCORPORATION OF A TWO-FLUX MODEL FOR RADIATIVE HEAT TRANSFER IN A COMPREHENSIVE FLUIDIZED BED SIMULATOR PART II: NUMERICAL RESULTS AND ASSESSMENT

2003 ◽  
Vol 2 (2) ◽  
Author(s):  
J. A. Rabi ◽  
M. L. De Souza-Santos
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Fluidized Bed Reactors ◽  
Transfer Model ◽  
Temperature Profiles ◽  
Transfer Rates ◽  
Gas Phases ◽  
Flux Model

As shown in the first part of this paper, equations and considerations for a preliminary attempt to improve the treatment for radiative heat transfer of a previous comprehensive simulation program were presented. For that, the two-flux radiative heat transfer model was applied. In this second part, the new version of that program was tested against steady-state operations of real equipment. Numerical simulations were carried for two different fluidized-bed reactors: a coal-fed boiler and a wood-fed gasifier. Computational results obtained with that new version were compared with those obtained with the previous simulator version. Then, both sets of results were also compared with real operational data. Special attention was paid to the temperature profiles of each particle species present in the bed section – carbonaceous, limestone and inert – as well as to the radiative heat transfer rates between these solids. Effects on the temperature profiles of the gas phases – emulsion and bubbles – and on the equipment performance parameters were also investigated. Improvements related to the incorporation of two-flux model are assessed and discussed. New developments and extensions of this approach are indicated.

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