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<p>An experimental investigation based on a transient inverse heat conduction approach aiming to improve thermal performance of waste heat recovery heat exchangers was conducted. The transient heat transfer from a main tube of diameter (D) at constant heat flux condition and cross-flow of air at Reynolds number 15000 was investigated using thin tube of six different diameters (d) from 7.5 mm to 15 mm. A thin tube was placed upstream to the main tube at six different spacing from 0.75D to 2D. Results shows that the heat transfer influenced by diameter ratio d/D and spacing ratio L/D has distinct phenomenon in three regimes: quiescent, protuberance, and vortex-shedding. Combined effect of flow blockage area and available gap between the thin and main tubes has great influence on thermal enhancement factor. Low diameter ratio exhibits thermal enhancement of about 12.5±2.5 % attaining maximum for d/D=0.25, L/D=1.75.</p>

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Experimental investigation of heat transfer from a tube in the wake flow of thin tubes

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Apoorva Deep Roy,
  • Sushil Kumar Dhiman

摘要

An experimental investigation based on a transient inverse heat conduction approach aiming to improve thermal performance of waste heat recovery heat exchangers was conducted. The transient heat transfer from a main tube of diameter (D) at constant heat flux condition and cross-flow of air at Reynolds number 15000 was investigated using thin tube of six different diameters (d) from 7.5 mm to 15 mm. A thin tube was placed upstream to the main tube at six different spacing from 0.75D to 2D. Results shows that the heat transfer influenced by diameter ratio d/D and spacing ratio L/D has distinct phenomenon in three regimes: quiescent, protuberance, and vortex-shedding. Combined effect of flow blockage area and available gap between the thin and main tubes has great influence on thermal enhancement factor. Low diameter ratio exhibits thermal enhancement of about 12.5±2.5 % attaining maximum for d/D=0.25, L/D=1.75.