CFD based analysis of flow distribution in a coaxial vacuum tube solar collector with laminar flow conditions

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• 作者：Abdul Waheed Badar (1)
  Reiner Buchholz (1)
  Yongsheng Lou (1)
  Felix Ziegler (1)
  
• 关键词：computational fluid dynamics ; junction pressure loss coefficient ; dividing manifold ; combining manifold ; flow distribution
• 刊名：International Journal of Energy and Environmental Engineering
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：3
• 期：1
• 全文大小：1135KB
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• 作者单位：Abdul Waheed Badar (1)
  Reiner Buchholz (1)
  Yongsheng Lou (1)
  Felix Ziegler (1)
  
  1. Institut f眉r Energietechnik, KT 2, FG Maschinen- und Energieanlagentechnik, Technische Universit盲t Berlin, Marchstra脽e 18, Berlin, 10587, Germany
  
• ISSN：2251-6832

文摘

A computational fluid dynamics (CFD) analysis has been conducted to find the pressure losses for dividing and combining fluid flow through a tee junction of a solar collector manifold. Simulations are performed for a range of flow ratios and Reynolds numbers, and equations are developed for pressure loss coefficients at junctions. A theoretical model based on successive approximations then is employed to estimate the isothermal and non-isothermal flow distribution in laminar range through a collector consisting of 60 vacuum tubes connected in parallel in a reverse (U-configuration) and parallel (Z-configuration) flow arrangement. The results are in reasonable agreement with the available experimental results for U-configuration. The proposed CFD based strategy can be used as a substitute to setting up and performing costly experiments for estimating junction losses.