Heat Transfer Enhancement in a Rectangular Duct with Rib Turbulators
Abstract
The present paper is a review of research work on heat transfer enhancement in a rectangular duct withrib turbulators. In the present paper emphasis is given to works dealing with rib turbulators because according to the recent studies, these are known to be economic tool in the field of heat transfer enhancement. The use of rib turbulator has been found to be an efficient method of enhancing the heat transfer to fluid flowing in the rectangular duct. Detailed information about the heat transfer and flow characteristics in ribbed ducts is very important in proper designing of rectangular ducts, heat exchangers and cooling systems of gas turbine engines. The application of rib turbulator in the form of fine wires of different shapes has been recommended to enhance the heat transfer coefficient by several investigators. It has been found that the main thermal resistance to the convective heat transfer is due to the presence of laminar sub layer on the heat-transferring surface. The ribs break the laminar sub layer and create local wall turbulence due to flow separation and reattachment between consecutive ribs, which reduce the thermal resistance and greatly enhance the heat transfer. However, the use of rib turbulator results in higher friction and hence higher pumping power requirements. The thermo-hydraulicperformance of rectangular duct withrib turbulatorsdepends on the various factorssuch as flow conditions, geometry of rib and different configurations.
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