Heat transfer and friction characteristics of artificially roughened solar air heater duct: a review

The use of artificial roughness is an effective technique to enhance the rate of heat transfer by creating turbulence in a fully developed turbulent flow. Investigators reported number of roughness geometries on the heat transfer and friction characteristics of the artificially roughened solar air heater duct. In this paper an attempt has been made to review the different roughness arrangement and geometries to improve the heat transfer capability of solar air heater duct. The correlation of heat transfer and friction characteristics of 15 solar air heater ducts has been presented in Table1