Research On Heat Transfer Enhancement And Structural Optimization Of Spiral Warped Surface Rib Plate Heat Exchanger

In our daily life and engineering technical field, Heat transfer is a very commonphenomenon. In order to achieve the heat transfer, we will use the heat exchanger tobe a one of the most basic equipment usually.So how to improve the performance ofheat transfer which means heat transfer enhancement is always the key of the scholarsand experts at home and abroad research. In recent years, with the rapid developmentof the world economy and society, the issue of energy and resource shortage wasgetting increasingly serious. The heat exchanger is taken chemical energy and so on inessential industry domain indispensable general purpose equipment, which plays anindispensable role in the energy saving project. It directly affects the energyutilization by the merits of heat transfer performance of the heat exchanger.Plate heat exchanger is widely applied in all the various trades and occupations,which is due to its high heat transfer efficiency, compact structure, small footprint,high self-cleaning ability, easy to install and transport and the other advantages.Therefore, how to use the enhanced heat transfer technology to develop or study theplate heat exchanger is not only the key to solve the problem of the development ofmodern industry, but also in response to national conditions, carrying out anurgent task of energy conservation.Being a new type of passive heat transfer enhancement components,3-d rib hassome properties such as without additional power, simple structure and remarkableeffect on strengthening heat transfer. It not only expands the heat transfer slab area ofheat-exchanger, and increases the heat transfer coefficient between fluid and rib, butalso reduces the synergy angle between speed and temperature gradient.Therefore, in this paper, the screw surface of3-d rib as disturbing element willbe applied to the plate heat exchanger. Using related basic theory of fluid mechanics and heat transfer analyze the mechanism of three-dimensional rib enhanced heattransfer, and application of three dimensional modeling software Pro/E create physicalmodel. In order to draw heat exchanger law, the computational fluid dynamicssoftware Fluent is used to carry out numerical simulation and study the effects on heattransfer by spiral surface three-dimensional ribbed helix angle(θ), stream angle(β), ribcrosswise spacing(Pt), the rib width and the rib longitudinal spread ratio(v=b/s), andother parameters. For drawing optimize the structure and combination, it need toconfirm by designing the reasonable orthogonal experiment and the simple sceneexperiment. Furthermore, it can seek an appropriate burble Yuan form and the designparameter and achieve structural optimization.The result demonstrates that: In the Reynolds number range2300~9500, The ribfor fork row has a better heat transfer effect. In four influence factors, welcomes angleof attack is the biggest influence on the heat transfer, then that is the rib crosswisespacing and the spiral angle, and the smallest is rib width and the rib longitudinalspread ratio the influence. Through the orthogonal experiment and the simple sceneexperiment obtaining data, when the3-d rib’s spiral angle θ is35°, attack angle β is60°, rib crosswise spacing Pt is13mm, the rib width and rib longitudinal spread ratiov is0.65, the plate heat exchanger has highest efficiency of heat transfer and bestresult. The experiment data and numerical simulation data of relative error is within15%which is the allowed range, and also indicates the validity of the physical modeland the feasibility of the numerical simulation method.