TITLE:
Thermodynamic Head Loss in a Channel with Combined Radiation and Convection Heat Transfer
AUTHORS:
Deodat Makhanlall, Peixue Jiang
KEYWORDS:
Radiation-Convection Heat Transfer, Thermodynamic Head Loss, Entropy Generation
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.2 No.9,
September
15,
2014
ABSTRACT: Losses in channel flows are usually
determined using a frictional head loss parameter. Fluid friction is however
not the only source of loss in channel flows with heat transfer. For such flow
problems, thermal energy degradation, in addition to mechanical energy
degradation, add to the total loss in thermodynamic head. To assess the total
loss in a channel with combined convection and radiation heat transfer, the
conventional frictional head loss parameter is extended in this study. The
analysis is applied to a 3D turbulent channel flow and identifies the critical
locations in the flow domain where the losses are concentrated. The influence
of Boltzmann number is discussed, and the best channel geometry for flows with
combined heat transfer modes is also determined.