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ホーム アーカイブ 役員 今後の会合 American Society of Thermal and Fluids Engineering

CROSSFLOW MIXED CONVECTION HEAT TRANSFER FOR HORIZONTAL TUBE BANKS

Christy Laird
Heat Transfer Research, Inc., 150 Venture Drive, College Station, TX 77845, USA

LiDong Huang
Heat Transfer Research, Inc., 150 Venture Drive, College Station, TX 77845, USA

DOI: 10.1615/TFESC1.tia.012911
pages 2057-2060


キーワード: Mixed convection, Horizontal tube bank, Crossflow

要約

Industrial heat exchangers are regularly designed for forced convection dominant flow, but natural convection may impact heat transfer for certain fluids or under turndown conditions. In this study, we measured mixed convection heat transfer for p-xylene and propylene glycol liquids in vertical flow over ideal horizontal plain and low-finned tube banks. Our study shows that aiding natural convection may either significantly enhance or penalize forced convection heat transfer under certain conditions; in addition, our limited data for opposing natural convection affirm that it may significantly penalize or have little impact on heat transfer, depending on the tube geometry and conditions. When natural convection enhances heat transfer, a regime-based correlation predicts coefficients as much as twice as high as the forced convection coefficient. However, when natural convection penalizes heat transfer, the correlation predicts coefficients as low as half the value of the forced convection coefficient. Further study of mixed convection regimes will support development of a generalized correlation.

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