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Performance study of solar air heater duct with gap in V-rib with symmetrical gap and staggered ribs

机译：带对称缝隙和交错肋的V型肋中带缝隙的太阳能热水器管道的性能研究

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摘要

Experimental study of SAH duct having absorber plate roughened with gap in V-rib with symmetrical gap and staggered ribs is carried out and effect on Nusselt number (Nu) and friction factor (f) is investigated. Range of parameters for the present study are Reynolds number (Re) of 4000-14,000, ratio of rib pitch to height (P/e) of 12, ratio of rib height to hydraulic diameter (e/D-h) of 0.043, flow angle of attack (alpha) of 60(o), ratio of staggered rib position to pitch (P'/P) of 0.65, ratio of gap width to rib height (g/e) of 4, ratio of staggered rib size to rib height (r/e) of 4, relative gap position of gap in each of symmetrical rib elements (d/w) of 0.65, relative gap width of additional gap in each of symmetrical rib elements (g'/e) of 1 and number of gaps (N-g) of 1, 2, 3 and 4. Maximum augmentation in Nu and f is 2.05 and 3.39 times the smooth plate respectively corresponding to number of gaps (N-g) of 3. Thermo-hydraulic performance parameter (THPP) is also obtained maximum for number of gaps (N-g) of 3. Correlations for heat transfer and friction factor have also been developed. Experimental data is used for validation of mathematical model and is used for prediction of performance of SAH under different operating condition for the roughness considered.
机译：进行了SAH管道的实验研究，该管道的吸收板在带有对称间隙的V型肋中具有间隙，且肋交错，从而使粗糙化，并研究了其对努塞尔数（Nu）和摩擦系数（f）的影响。本研究的参数范围是雷诺数（Re）为4000-14,000，肋距与高度的比（P / e）为12，肋高与水力直径的比（e / Dh）为0.043，流角为攻角（α）为60（o），交错的肋骨位置与间距（P'/ P）之比为0.65，间隙宽度与肋骨高度之比（g / e）为4，交错的肋骨尺寸与肋骨高度之比（ r / e）为4，每个对称肋元件中间隙的相对间隙位置（d / w）为0.65，每个对称肋元件中的附加间隙的相对间隙宽度（g'/ e）为1，并且间隙数（Ng）为1、2、3和4。Nu和f的最大增加量分别是光滑板的2.05和3.39倍，分别对应于间隙数（Ng）为3。热液性能参数（THPP）也获得了最大值间隙数（Ng）为3。还建立了热传递和摩擦系数之间的关系。实验数据用于数学模型的验证，并用于在考虑到粗糙度的不同操作条件下预测SAH的性能。

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  • 来源
    《Heat and mass transfer》 |2019年第9期|2517-2532|共16页
  • 作者

    Patel Sumer Singh; Lanjewar Atul;

  • 作者单位

    Maulana Azad Natl Inst Technol, Dept Mech Engn, Bhopal 462003, Madhya Pradesh, India;

    Maulana Azad Natl Inst Technol, Dept Mech Engn, Bhopal 462003, Madhya Pradesh, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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