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Research on Heat Transfer Enhancement and Miniaturization Technology in Lubricant Cooler

Author: ShiShuai
Tutor: YanChangZuo
School: Harbin Engineering University
Course: Thermal Power Engineering
Keywords: New type oil cooler Integral pin-fin tube Longitudinal flow heat exchanger Mixed tube bundle Visualization
CLC: TK172
Type: Master's thesis
Year: 2010
Downloads: 37
Quote: 0
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Abstract


Oil cooler is a kind of heat transfer equipment, which is widely used in power, machinery and other area, commonly with plain tubes as heat transfer components, and as such, leads to low heat transfer efficiency and large volume of the heat exchanger. Based on analyzing a great deal of literatures, a new type of longitudinal-flow oil cooler, which uses integral pin-fin tube and plain tube as heat transfer components, is designed to overcome these difficulties. The two kinds of tubes are arranged mixed and double flow way is adopted in the oil cooler; meanwhile, in order to visualize the experimental research, two plexiglasses panels are installed on both sides of the oil cooler.A lot of experimental research has been done to the new oil cooler. Using the 68# turbine oil as the working fluid, comparison was made between the double flow way circular oil cooler and the single flow way rectangular oil cooler. The experimental results show that the total heat transfer coefficient and heat transfer per unit volume of the new oil cooler are higher, this design achieved the purpose of heat transfer enhancement and miniaturization. Within the experimental range, and while the shell-side Reynolds number is same, the heat transfer characteristics was also compared between the new rectangular double flow way oil cooler and the double flow way circular oil cooler. When the oil inlet temperature is 55℃, and water flow rate is 20m3/h, the total heat transfer coefficient of the former is about 1.1~1.3 times and the heat transfer per unit volume is 1.2~1.4 times that of the latter. When the oil inlet temperature is 55℃and water flow rate is 16m3/h, the total heat transfer coefficient and heat transfer per unit volume of the new type oil cooler is around 0.73~0.88 and 0.80~0.91times that of the single flow way rectangular oil cooler. With the help of the visualized experimental research, the flow condition of the oil was observed. Accordingly, the problems met in the experiments were analyzed and solutions were proposed as well. In addition, by using the software of FLUENT, the flow, temperature and pressure field outside the pin-fin tub was given. The results show that the pin-fin intensifies the separation of the boundary layer and its turbulence, which enhanced the heat transfer. The heat transfer enhancement mechanism of the pin-fin tube was further analyzed in the end.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Industrial thermal equipment > Heat Transfer Equipment
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