| This paper is committed to researching the high-efficiency oil cooler, and theperformance of shell-tube oil cooler with different structure is experimentally studied by thetest system of heat transfer performance of oil cooler. In the paper, the heat transfer andresistance performance of oil cooler of thread finned tube with different fin angle areinvestigated by experiments, which are supported with spiral baffle and new-style baffle, andthe effect of ratio of length-diameter to heat transfer performance is analyzed. Meanwhile,with the help of enterprise, a new laminated oil cooler is developed, and its performance isevaluated through three aspects of comprehensive performance, integral structure andeconomical efficiency. The main conclusions of this paper are as follows:(1) In the same baffle plate in shell side, the heat quantity and total heat transfercoefficient of5°fin angle increases10%~30%than13.5°fin angle, but the resistance of flowis very nearly the same. It shows that the heat transfer performance of small fin angle issuperior to the large fin angle, and the size of the fin angle has little impact on resistance offlow.(2) The heat transfer effect of new-style baffle is inferior to spiral baffle plate, but itspressure drop reduces30%~40%, and the heat quantity unit pressure drop increases10%~40%, so this structure has certain research significance for oil cooler with large flow,large length-diameter ratio and high demand for pressure drop in shell side.(3) Within limit of oil flow, the larger the length-diameter ratio, the better the heattransfer effect, and the bigger the pressure drop in shell side for the oil cooler with same heattransfer area and different length-diameter ratio. However, with the increase of oil flow, theflow resistance of oil cooler with a big length-diameter ratio is much larger than that with asmall length-diameter ratio, which leads to reduction of comprehensive performance.(4) The new laminated oil cooler has excellent heat transfer performance andcomprehensive performance, the heat quantity of which improves about52.5%than the spiraltube and segmental baffle oil cooler, and the heat quantity unit pressure drop increases about24.1%. There is also advantage for the new laminated oil cooler at the aspect of integralstructure, its heat transfer area unit volume is2.84times as much as the spiral tube andsegmental baffle oil cooler, and the total material weight is only60.7%of the spiral tube andsegmental baffle oil cooler, which shows the advantages of small volume, large heat transferarea and light weight for the new laminated oil cooler. From an economic point view, the newlaminated oil cooler saves more material cost than the spiral tube and segmental baffle oil cooler.(5) The experimental dates are analyzed by software of date processing, which isintended to get the relational expression of Nu and f in the heat-transfer medium of oil-water. |
