学术会议
Numerical investigation on oscillating flow and heat transfer of a 2D cooling gallery with rib structure
作者*

分会场

第十届内燃机可靠性技术国际研讨会

摘要

Rib structure could improve the heat transfer enhancement in the area of single-phase flow. For the sake of further investigating the influence of semicircular rib structure on the two-phase oscillating flow and heat transfer characteristics. The 2-dimensional Computational Fluid Dynamics (CFD) models of the cooling gallery are established under the engine speed of 2300r/min, with rib diameter of 2mm, 4mm, 6mm and 8mm, respectively. The SST k-ω turbulence model and the VOF+Level-Set are used to capture the flow pattern and predict the two-phase flow interface in this study. A visual experiment is performed to validate the CFD model. The results show that during the reciprocating motion of the gallery, both sides of the rib are impinged and flushed continuously by the cooling oil. Hence, the heat transfer of both sides of the rib can be enhanced, the peak value of heat transfer coefficient (HTC) increased by 100.5% compared to the gallery without rib structure at the same position when the rib diameter is 2mm. The increase of rib diameter has little influence on the peak value of the average HTC near the rib and the left wall. However, the oil flow velocity on the flat wall and the impingement velocity on the top wall weakened to varying degrees due to the introduction of rib structure, which makes the reduction of the average HTC of the flat wall and the top wall. Furthermore, the larger the rib diameter, the more reduction of the average HTC of the flat wall and the top wall. When the rib diameter is 8mm, the reduction on the flat wall and the top wall is the biggest, which is 10.7% and 8.3%, respectively. Numerical results in this study are able to provide a foundation for the heat transfer enhancement of the cooling gallery.

关键词

Oscillating flow; Heat transfer; Cooling gallery; Rib structure; Numerical investigation

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