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<p>This study investigates the effectiveness of tetrahedron-shaped turbulators attached to the bottom surface of a heated absorber plate to increase heat transfer in solar air heaters (SAHs). By utilizing three-dimensional computational fluid dynamics analysis, this study evaluates the impact of these turbulators on the heat transfer while accounting for friction losses in an in-line arrangement. The tetrahedron geometry significantly improves the heat transfer efficiency, with the thermo-hydraulic performance (THP) parameter serving as a quantitative metric for assessing heat transfer enhancement, incorporating friction energy losses and aiding in the optimization of turbulator geometry. The results of a parametric study indicate that a reduced relative longitudinal pitch (<i>P</i>/<i>D</i>) ratio significantly enhances the effectiveness of turbulators at a constant Reynolds number. Additionally, increased turbulator height correlates with improvements in the Nusselt number by facilitating better mixing within the SAH. The leading-edge angle of the turbulator emerges as a critical determinant of THP, with a negative angle <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\left(\beta =-30^\circ \right)\)</EquationSource> </InlineEquation> demonstrating significant performance enhancements over a neutral angle <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\left(\beta =0^\circ \right)\)</EquationSource> </InlineEquation>, which is attributed to improved mixing dynamics and reduced frictional resistance. The study identifies an optimal THP value of 1.78, which is achieved with <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\((P/D)=0.812\)</EquationSource> </InlineEquation>,<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\((e/D)=0.27\)</EquationSource> </InlineEquation>,<InlineEquation ID="IEq5"> <EquationSource Format="TEX">\((p/D)=0.75\)</EquationSource> </InlineEquation>, and <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\beta =-30^\circ\)</EquationSource> </InlineEquation> at a Reynolds number of 9000.</p>

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Enhancement of thermal performance in rectangular solar air heater duct using tetrahedron-shaped turbulators

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月28日

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  • Anoop Kanjirakat,
  • Anuraag M. Kamath,
  • Sohail A. Khan,
  • V. Shubhamkar,
  • Dolfred Vijay Fernandes

摘要

This study investigates the effectiveness of tetrahedron-shaped turbulators attached to the bottom surface of a heated absorber plate to increase heat transfer in solar air heaters (SAHs). By utilizing three-dimensional computational fluid dynamics analysis, this study evaluates the impact of these turbulators on the heat transfer while accounting for friction losses in an in-line arrangement. The tetrahedron geometry significantly improves the heat transfer efficiency, with the thermo-hydraulic performance (THP) parameter serving as a quantitative metric for assessing heat transfer enhancement, incorporating friction energy losses and aiding in the optimization of turbulator geometry. The results of a parametric study indicate that a reduced relative longitudinal pitch (P/D) ratio significantly enhances the effectiveness of turbulators at a constant Reynolds number. Additionally, increased turbulator height correlates with improvements in the Nusselt number by facilitating better mixing within the SAH. The leading-edge angle of the turbulator emerges as a critical determinant of THP, with a negative angle \(\left(\beta =-30^\circ \right)\) demonstrating significant performance enhancements over a neutral angle \(\left(\beta =0^\circ \right)\) , which is attributed to improved mixing dynamics and reduced frictional resistance. The study identifies an optimal THP value of 1.78, which is achieved with \((P/D)=0.812\) , \((e/D)=0.27\) , \((p/D)=0.75\) , and \(\beta =-30^\circ\) at a Reynolds number of 9000.