Basapur, Mehaboob Basha (2008) Prediction of turbulent heat transfer in a rotating narrow rectangular channel (AR=10) oriented at 120° from the direction of rotation. Masters thesis, King Fahd University of Petroleum and Minerals.

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Arabic Abstract

ﺗﻢ ﻋﻤﻞ دراﺳﺔ ﺣﺴﺎﺑﻴﺔ ﻋﻠﻰ ﺳﺮﻳﺎن ﻣﻀﻄﺮب ﺛﻼﺛﻲ اﻷﺑﻌﺎد واﻧﺘﻘﺎل اﻟﺤﺮارة ﻓﻲ ﻗﻨﺎة دوارة ذات ﺷﻜﻞ ﺗﺮآﺰت اﻟﺪراﺳﺔ ﻋﻠﻰ ﺗﺄﺛﻴﺮ . ﻣﻦ اﺗﺠﺎﻩ اﻟﺪوران 120 ˚ و 90 ˚ ﺑﺰاوﻳﺘﻴﻦ 10 :1 ﻣﺴﺘﻄﻴﻞ وﻟﻬﺎ ﻧﺴﺒﺔ ﺑﻌﺪﻳﺔ ﺗﻢ . درﺝﺔ 120 اﻧﺘﻘﺎل اﻟﺤﺮارة ﻓﻲ اﻻﺗﺠﺎﻩ اﻟﺪوران اﻟﺴﺮﻳﻊ وﻧﺴﺒﺔ اﻟﻜﺜﺎﻓﺔ اﻟﻌﺎﻟﻴﺔ ﻋﻠﻰ ﺧﺼﺎﺋﺺ واﻟﺬي ﻳﻌﺘﻤﺪ ﻃﺮﻳﻘﺔ اﻟﺤﺠﻢ اﻟﻤﺤﺪود ﻟﺤﺴﺎﺑﺎت اﻟﺴﺮﻳﺎن واﻧﺘﻘﺎل اﻟﺤﺮارة Fluent( ) اﺳﺘﺨﺪام ﺑﺮﻧﺎﻣﺞ ﺗﻢ . وﻓﻴﻪ ﺗﻢ ﺗﻘﺴﻴﻢ اﻟﻨﻄﺎق اﻟﺤﺴﺎﺑﻲ إﻟﻰ ﺗﻘﺴﻴﻤﺎت ﺹﻐﻴﺮة ﺝﺪا ﻟﺘﺤﻠﻴﻞ اﻟﻄﺒﻘﺔ اﻟﻠﺰﺝﺔ ﺑﺠﻮار اﻟﺠﺪا رﺮﻳﺎن اﻟﻤﻀﻄﺮب واﻧﺘﻘﺎل اﻟﺤﺮارة ﻓﻲ اﻟﻘﻨﺎة اﻟﺪوارة رﻳﻨﻮﻟﺪز ﻟﻺﺝﻬﺎد ﻟﺤﺴﺎب اﻟﺴ ج اﺳﺘﺨﺪام أﻧﻤﻮذ آﺬﻟﻚ ﺗﻢ دراﺳﺔ ﺗﺄﺛﻴﺮ , ﺣﻴﺚ أن هﺬا اﻷﻧﻤﻮذج ﻳﺄﺧﺬ ﺑﻌﻴﻦ اﻻﻋﺘﺒﺎر اﻟﺘﺄﺛﻴﺮات اﻟﻨﺎﺗﺠﺔ ﻋﻦ اﻟﺪوران اﻟﺪوران واﻟﻨﺴﺒﺔ ﺑﻴﻦ آﺜﺎﻓﺔ ﺳﺎﺋﻞ اﻟﺘﺒﺮﻳﺪ ﻋﻦ اﻟﻤﺪﺧﻞ وآﺜﺎﻓﺘﻪ ﻋﻦ اﻟﺠﺪار ﻋﻠﻰ ﺧﺼﺎﺋﺺ آﻞ ﻣﻦ ( Ro > 0.25 > 0 ) ﺋﺞ اﻟﺪراﺳﺔ ﻷرﻗﺎم اﻟﺪوران ﻓﻲ اﻟﻤﺪى اﻟﺴﺮﻳﺎن واﻧﺘﻘﺎل اﻟﺤﺮارة وﺗﻢ ﺗﺴﺠﻴﻞ ﻧﺘﺎ ( . ρ/ ∆ρ > 0.4> 0.07 ) وﻧﺴﺐ آﺜﺎﻓﺔ ﻓﻲ اﻟﻤﺪى اﻟﻨﺘﺎﺋﺞ اﻟﺤﺴﺎﺑﻴﺔ اﻟﺘﻲ ﺗﻢ اﻟﺤﺼﻮل ﻋﻠﻴﻬﺎ ﺗﺘﻮاﻓﻖ ﺑﺼﻮرة ﺝﻴﺪة ﻣﻊ اﻟﻨﺘﺎﺋﺞ اﻟﻌﻤﻠﻴﺔ واﻟﺪراﺳﺔ أوﺽﺤﺖ أن ﺠﺎل اﻟﺴﺮﻳﺎن واﻧﺘﻘﺎل اﻟﺤﺮارة ﻧﺴﺒﺔ اﻟﻜﺜﺎﻓﺔ ورﻗﻢ اﻟﺪوران واﺗﺠﺎﻩ اﻟﻘﻨﺎة ﻟﻬﻢ ﺗﺄﺛﻴﺮ آﺒﻴﺮ ﻋﻠﻰ ﺧﺼﺎﺋﺺ ﻣ ﻓﻲ ﺣﺎﻟﺔ اﻟﻘﻨﺎة اﻟﺪوارة ذات اﻟﺸﻜﻞ اﻟﻤﺴﺘﻄﻴﻞ آﻤﺎ ﻟﻮﺣﻆ ﺣﺪوث ﺳﺮﻳﺎن ﻋﻜﺴﻲ ﻋﻨﺪ اﻟﻘﻴﻢ اﻟﻌﺎﻟﻴﺔ ﻟﺮﻗﻢ . اﻟﺪوران وﻧﺴﺒﺔ اﻟﻜﺜﺎﻓﺔ

English Abstract

A computational study is performed on three-dimensional turbulent flow and heat transfer in a rotating rectangular channel with aspect ratio (AR) of 1o:1, oriented at 90° and 120° from the direction of rotation. Focus is on effects of high rotation and high-density ratios on the heat transfer characteristics of the 120° orientation. The finite volume code, FLUENT is used to predict the flow and heat transfer. Computational domain is meshed with fine grids to resolve the near wall viscous layer. The Reynolds stress model (RSM), which accounts for rotational effects, is used to compute the turbulent flow and heat transfer in the rotating channel. The effects of rotation and coolant-to-wall density ratio on the fluid flow and heat transfer characteristics are reported on a moderate range of rotation numbers and density ratios (0 < Ro < o.25 and 0.07 < Δρ/ρ < 0.4). The computational results are in good agreement with experimental data. The results show that the density ratio, rotation number and channel orientation significantly affect the flow field and heat transfer characteristics in the rotating rectangular channel. Flow reversal occurs at high rotation number and density ratio.