ENHANCEMENT OF HEAT TRANSFER STRATEGIES IN DOUBLE PIPE HEAT EXCHANGER: A REVIEW

Abstract

Double pipe heat exchangers (DPHEs) are widely used in various industries due to their simple design and high heat transfer efficiency. This review paper comprehensively examines methods to enhance heat transfer performance in DPHEs, categorizing them into active, passive, and compound methods. Active methods explored include rotating the inner tube, while passive methods cover twisted tapes, finned surfaces, wire coils, and nanofluids. Each method is analyzed for its impact on heat transfer rate, pressure drop, and overall thermal performance. The novelty of this paper lies in its detailed comparative analysis of these methods, providing insights into the optimal design and operating conditions for maximizing thermal-hydraulic performance. The review highlights that while methods like using nanofluids and twisted tapes significantly improve heat transfer, they also increase pressure drops, necessitating a careful balance to optimize efficiency. These findings serve as a valuable resource for researchers and engineers developing efficient DPHE systems.