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In this communication, the computational fluid dynamics (CFD) technique is used to study the influence of longitudinal strip (circular & square) on the Nusselt number, pressure drop and overall heat transfer coefficient in double pipe heat-exchangers. For this purpose, longitudinal circular and square strips are inserted inside heat-exchangers where various sizes of meshed grill are developed and simulated at various Reynolds numbers by using the CFD soft-ware of Fluent. The validated model, made clear about the objective and the conditions which could exactly facilitate heat transfer throughout double pipe heat exchangers. Following the numerical simulation, proper pressure effect and heat transfer coefficient correlations for various sizes of longitudinal circular and square strip are considered with different flow rates under the turbulent flow. The outcome of this work indicates that longitudinal circular strip could improve the overall heat transfer coefficient when compared to the square strip and the pressure drop in the square strip side is high when compared to the circular strip side.

Numerical Analysis of Double Pipe Heat Exchanger with and without Strip