Research On Parameters Optimization Of Oil Cooler’s Structure And Performance

The shell-and-tube heat exchanger is more widely used in the petrochemical industrywith easily manufactured and good bearing performance. This paper involves the problem ofoil cooler’s structural optimization, and does some research on parameters optimation of a oilcooler with Cu/Al bimetal finned tubes and segmental baffles.The oil cooler uses water as a coolant to cool Exxon mobile anti-wear hydraulic oilproducts DTE24, DTE25, DTE26and DTE27. Through numerical simulation, it comparesand analyses heat transfer and pressure drop performance in different structural parametercombinations. For the finned tube side, researches the effect of fin height(h), fin spacing andthe physical performance parameters of hydraulic oil on heat transfer and pressure dropperformance by the method of element simulation, and confirms the best parametercombination of the finned tube. For the segmental baffles, studys the effect of baffle spacingand baffle cut on heat transfer and pressure drop performance by the method of segmentationsimulation, and finds the optimal baffle spacing and baffle cut. Besides, the accuracy ofnumerical simulation is verified by comparing with the results of empirical formulas and therelevent literature. The main conclusions are as follows:(1) Cu/Al bimetal finned tube expands greatly heat transfer area comparing to smoothtube, and fins of the finned tube can arouse flow disturbance, and promotes turbulence offluid nearby the wall of tube to reduce thickness of boundary layer.(2) h and b both have much effect on the heat transfer coefficientα oof oil side, thetotal heat transfer coefficientK oand the volumetric heat transfer capacityQv. The biggerthe number of h, the numbers ofα oandK oare bigger, but the number ofQv increasesfirstly then decreases, and the maximum number is at the point that h is equal to4mm.Within the scope of the test, the smaller b,α o,K oandQv.are bigger.(3) On the basis of that h is equal to4mm and b is equal to1.6mm, the biggeru h1,the biggerα o,K oandQv. Whenu h1is equal or greater than0.2m/s, the increasingtrends ofα o,K oandQv are very obvious. At last, the correlationα oare made accordingto the results of numerical simulation.(4) The heat transfer and pressure drop performance of the oil cooler is affected greatlybyl dandhd.α oandΔp oboth decrease obviously along with the increasing ofl dandhd. If using α o/Δp oas comprehensive performance index, the comprehensive performance of the oil cooler is best at the point thatl dis equal to140mm andhd is equal to48mm.(5) At the same ofu h1,α oof the oil cooler is as5.2times as that of the oil cooler withsegmental baffles and smooth tubes at most. If usingα o/Δ p1/3oas comprehensiveperformance index, the comprehensive performance of the former is as2.48times as that ofthe latter at most.