Thermal Radiation Effects on the Laminar Free Convection Boundary Layer of an Absorbing Gas

Abstract

The effects of thermal radiation upon the laminar free convection boundary layer of a vertical flat plate were studied for absorbing and nonabsorbing gases. Experimental velocity and temperature profiles were obtained for a constant heat flux boundary condition in air and CO2 and these are compared to analytical calculations for optically thin gases and absorbing gray gases. A correlation is presented by which plate surface temperatures as a function of plate emissivity for optically thin gases may be predicted for use in determining the convective heat transfer through standard non-radiative film heat transfer correlations.

Radiative Heat Transfer of an Optically Thick Gray Gas in The Presence of Indirect Natural Convection

“…Figure 3 reveals that the velocity 1 u slightly increases with increase in radiation parameter a R . The radiation conduction parameter a R defines the relative contribution of radiation heat transfer to thermal conduction transfer.…”

“…Mentioning the study of this type of problem with a view to analyse the transient approach of a radiative heat-transfer aspects of an optically thick fluid it seems to be appeared in the literature as studied by many authors. England and Emery [1] have investigated the thermal radiation effects of an optically thin gray gas bounded by a stationary plate. The hydromagnetic free convection flow with radiative heat transfer in a rotating and optically thin fluid has been investigated by Bestman and Adiepong [2] and Naroua et al [3].…”

MHD Free Convective Radiative and Chemicaly Reactive Flow Over a Vertical Porous Surface in the Presence of Diffusion-Thermo Effect

“…The equations (12) to (14) are coupled non-linear partial differential equations whose solutions in closed-form are difficult to obtain.To solve these coupled non-linear partial differential equations, we assume that the unsteady flow is superimposed on the mean steady flow, so that in the neighbourhood of the plate, we have…”

“…In such cases, one has to take into account the effect of thermal radiation and mass diffusion. The thermal radiation effects of an optically thin gray gas bounded by a stationary vertical plate was studied by England and Emery [14]. The radiative natural convective flow of an optically thin gray-gas past a semi-infinite vertical plate was considered by Soundalgekar and Takhar [15].…”

Radiation Effects on Unsteady MHD Free Convective Heat and Mass Transfer Flow Of Past a Vertical Porous Plate Embedded In a Porous Medium with Viscous Dissipation

“…Radiative heat and mass transfer play an important role in manufacturing industries for the design of fins, steel rolling, nuclear power plants, gas turbines and various propulsion devices for aircraft, missiles, satellites and space vehicles are examples of such engineering applications. England and Emery [25] have studied the thermal radiation effects of an optically thin gray gas bounded by a stationary vertical plate. Radiation effect on mixed convection along a isothermal vertical plate were studied by Hossain and Takhar [26].…”