Slip-flow heat transfer in rectangular microchannels

Laminar slip-flow forced convection in rectangular microchannels is studied analytically by applying a modified generalized integral transform techniq ue to solve the energy equation, assuming hydrodynamically fully developed flow. Results are given in terms of the fluid mixed mean temperature, and b oth local and fully developed mean Nusselt numbers. Heat transfer is found to increase, decrease, or remain unchanged, compared to non-slip-flow condi tions, depending on two dimensionless variables that include effects of rar efaction and the fluid/wall interaction. The transition point at which the switch from heat transfer enhancement to reduction occurs is identified for different aspect ratios. (C) 2001 Elsevier Science Ltd. All rights reserve d.