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The Analysis Of Flow Resistance And Heat Transfer Characteristics Of The Stainless Steel Fin Tube Heat Exchanger

Posted on:2013-01-19Degree:MasterType:Thesis
Country:ChinaCandidate:X W ShiFull Text:PDF
GTID:2231330374976494Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
Heat exchanger’s development is largely represents the new material. Because manyoccasions have serious corrosion phenomena, the countermeasures on one hand is surfacetreatment, on the other hand is to choose the anti-corrosion materials. The current applicationof the anti-corrosion materials is mainly the metal titanium tube, Hastelloy, super duplexstainless steel, zirconium pipe, etc.The heat transfer of the waste heat recovery heat exchanger is effected by materialproperty, surface area, especially the pipe structure shape, the convective heat organized wayand strength and so on various factors. As to the heat pipe in the heat exchanger, reasonablefunction structure is not only to increase the heat transfer area, more important is through themulti-scale structure to organize the reasonable flow pattern, in order to achieve the besteffect of the cooling purposes.This paper studied the effects of the stainless steel finned tube in different fin forms, finwidth, arrangement and fins spacing, inlet velicity on the heat exchanger thermal performance,and the fluid pressure loss, the change rule of the heat transfer coefficient and so on. Throughthe measurement of the heat recovery boiler, building the fin and tube bundle models, usingFLUENT software simulation and getting the fin temperature field, velocity field and heattransfer coefficient. The temperature distribution of corrugated fin and heat transfercoefficient are less even than the flat fin; In the same inlet velocity (2m/s), the heat transfercoefficient of the staggered corrugated fin increases about17.6%to the staggered flat fin; Inthe same fin form and the same fin spacing, the heat exchange of the staggered corrugated fininlet velocity for3m/s increases about38.89%for2m/s. The appropriate increasing of theinlet velocity has very great help on the enhancement of the fin heat transfer effectWhen inlet velocity is2m/s, staggered finned tube heat exchanger simulated outlettemperature is380K (107℃),and the measured outlet temperature is364.2K (71.2℃),relative error is4.3%; Simulation of total pressure drop is52pa and test total pressure drop is56pa, relative error is7.1%, both good agreement; The result of numerical simulation resultscan well described the working conditions of the heat exchanger.
Keywords/Search Tags:heat exchanger, stainless stee, fin tube, heat transfer features
PDF Full Text Request
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