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<p>Twisted tape is a swirl producing insert which creates co-swirl and counter-swirl fluid motion in a heat exchanger tube. The present experimental work investigates the effect of perforations with V-winglet in double perforated twisted tape (DPTT) with co-swirl (CO) and counter-swirl (COT) orientations on thermal performance and entropy generation of a tubular heat exchanger. During the experimental data collection, the Reynolds number (Re) is varied in the range of 10,400–22,800 and the twist ratio (y) of insert is varied from 2 to 6. The experiments are also performed for single solid twisted tape (STT) and perforated twisted tape (PTT) under similar operating conditions. The Nusselt number has been enhanced up to 2.91 for DPTT-COT (V-winglet-2, y: 2). However, the maximum thermal performance factor (η) of 1.82 is attained by DPTT-COT (V-winglet-2, y: 4). The entropy generation number (N<sub>s</sub>) attains a minimum value for the DPTT-COT (V-winglet-1, y: 6). Among all enhanced tube geometry of the twisted tape, DPTT-COT (V-winglet-2, y: 2) has the highest exergy efficiency.</p>

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Heat transfer and entropy generation in a heat exchanger tube carrying double twisted tape with perforations and v-winglets

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Bipin Kumar,
  • Anil Kumar Patil,
  • Manoj Kumar

摘要

Twisted tape is a swirl producing insert which creates co-swirl and counter-swirl fluid motion in a heat exchanger tube. The present experimental work investigates the effect of perforations with V-winglet in double perforated twisted tape (DPTT) with co-swirl (CO) and counter-swirl (COT) orientations on thermal performance and entropy generation of a tubular heat exchanger. During the experimental data collection, the Reynolds number (Re) is varied in the range of 10,400–22,800 and the twist ratio (y) of insert is varied from 2 to 6. The experiments are also performed for single solid twisted tape (STT) and perforated twisted tape (PTT) under similar operating conditions. The Nusselt number has been enhanced up to 2.91 for DPTT-COT (V-winglet-2, y: 2). However, the maximum thermal performance factor (η) of 1.82 is attained by DPTT-COT (V-winglet-2, y: 4). The entropy generation number (Ns) attains a minimum value for the DPTT-COT (V-winglet-1, y: 6). Among all enhanced tube geometry of the twisted tape, DPTT-COT (V-winglet-2, y: 2) has the highest exergy efficiency.