Comparison Of CFD and Experimental Performance Results of Relation Between Nusselt Number and Reynolds Number in the Analysis of Pin Fins with Different Geometries

Mechanical Engineering, Heat Transfer in Pin Fins

The advantages of numerical modelling compared with experimental studies (e.g. reduced cost, easy control of the variables, high yield etc.) are well known. Theoretical studies where experimental validation is also presented provide an important added value to numerical investigations. In the present paper, CFD and experimental performance results the analysis of Pin Fins with Different Geometries are presented and compared. The Different Geometries were achieved by converting the external periphery of the simple pin into helically grooved and square threaded profiles. Reynolds number is chosen based on the work in Performance analysis of a heat exchanger having perforated square fins. Once an optimum shape of the pin fins is chosen, the flow velocity is varied without changing any other parameters. This arrangement results in a variation in Nusselt number and friction factor while keeping the pin fin height and (Sy/D) ratio constant. The physical model of the project is built according to the experimental model. It consists of three different sections viz. inlet section, test section, and exit section. The fluid and pin fins were modelled as a ‘conjugated’ computational domain to solve the problem. To calculate the reading, the pin fin cross section in the stream wise direction is modelled, and applied to the domain boundary. The graphs were then plotted for the dependability of Nusselt number on the Reynolds number, and were compared on the basis of results obtained from CFD and actual experimental setup.

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