FIELD COORDINATION ANALYSIS OF CONVECTION HEAT TMANSTER IN RECTANGULAR DUCTS WITH DIFFERENT THERMAL BOUNDARY CONDITIONS

摘要

The dimensionless temperature distributions and Nusselt numbers are numerically obtained for fully developed laminar flow in rectangular ducts with special T (constant temperature) and H2 (constant heat flux) thermal boundary conditions, including three or one heated sides. The aspect ratio of the rectangular cross-section varies from 1 to 0.01. Field Coordination equations are derived for different thermal boundary conditions. Effects of thermal boundary condition and aspect ratio on fluid temperature field and Nusselt number are discussed and analyzed from the views of Field Coordination Principle.