The double pipe heat exchanger type has low heat transfer rate compared with other types of heat exchangers. Therefore, this article aims to enhance the heat transfer rate of that type of heat exchanger by introducing a rotation of the exchanger inner pipe combined with changing the pipes eccentricity. Three dimensional, steady state, and incompressible CFD model was constructed for investigation of the effect of rotation and eccentricity on the heat transfer rate. A double pipe heat exchanger which was used for this study consists an inner pipe and an outer pipe of diameter 50 mm and 150 mm respectively with a length of 2000 mm. The inner pipe is assumed to rotate at a variable speed of 0, 100, 200, 300, 400 and 500 rpm and the eccentricity of the inner pipe is changed from 0.0 to 40 mm from the center of the outer pipe. The results showed a significant enhancement in the heat transfer rate due to the eccentricity change and the inner tube rotation. However, the pressure loss through the heat exchanger increases with the increase in the rotational speed of inner pipe.
Heat and Mass Transfer, heat Exchangers, Modeling
Cite this paper
Marwa A.M. Ali, Wael M. El-maghlany, Yehia A. Eldrainy, Abdelhamid Attia. (2019) Numerical Investigation of Heat Transfer Enhancement of Double Pipe heat exchanger. International Journal of Theoretical and Applied Mechanics, 4, 33-39
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