A comprehensive numerical study on multi-criteria design analyses in a novel form (conical) of double pipe heat exchanger

Abstract In this paper, conical tube was employed instead of cylindrical tube as a novel improved geometry for double pipe heat exchangers. Additionally, various conical tube arrangements with different flow directions (cold or hot flow from big side to small side and vice versa) were investigated. Totally, 3-D model of conical double pipe heat exchanger (CDPHE) has been numerically probed for nine cases. A comprehensive study was performed in order to analyze the effect of hydraulic, geometrical and thermodynamic characteristics in presented heat exchanger. Entropy generation, entropy generation number, heat exchanger reversibility norm (HERN), heat transfer improvement number and effectiveness–NTU (number of transfers unit) are the important concepts which were considered for each nine cases. The results show 55% and 40% increment in effectiveness and heat transfer improvement number at the optimum condition.

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