Journal of Mechanical Engineering Science · 1962 · 54 citations · 0 references
EngineeringMechanical EngineeringPhysicsFluid DynamicsHeat TransferThermal AnalysisHeat ConductionHeat FlowHeat Transfer AnalysisHeat Transfer FundamentalsHeat Transfer In FluidsThermal Boundary LayersChannelsHeat Transfer Boundary ConditionsHeat Transfer CoefficientsHeat Transfer In ChannelsHeat Transfer In DuctsHeat Transfer In PipesSurface Heat TransferSurface Heat Transfer Coefficients
The author proposes a method of comparing the heat transfer coefficients in two channels in which (1) the cross-sectional shape is different; (2) there are different proportions of rough and smooth surfaces; (3) there are different proportions of heated and unheated surfaces. In particular the method applies to experimental results for the system in which a roughened, heated cylinder is placed centrally in a smooth unheated pipe. The effective diameter concept is used to allow for changes in shape, and the heat-transfer boundary conditions are modified to make them similar to the fluid-flow boundary conditions before the comparison is made.