Calculation of radiative heat transfer in laminar fluid flow in a channel

Abstract

One of the main problems that occur during the design of the heat exchangers that operate at elevated temperatures is development of effective methods of calculation for heat carriers heating. The difficulty is that convective heat exchange mechanism with a rise in temperature of heat-carrying agent is strongly enhanced by radiative transfer, and heat flow on the outer channel surface becomes a non-linear function of the surface temperature. This article offers a method that allows evaluating real thermal field both “above” and “below”. While, the solutions quality is estimated at width of boundary zone, the smaller interval between such boundary zones, the higher is the quality of the recommended method.

Keywords

• heat exchanger
• high-temperature processes
• thermal radiation heat exchanger
• analytical calculations
• nonlinear tasks
• surface temperature
• evaluation of t real thermal field “above”
• evaluation of real thermal field “below”
• eigen functions
• eigen values