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首页> 外文期刊>Journal of enhanced heat transfer >CHOICE AND JUSTIFICATION OF THE HEAT TRANSFER INTENSIFICATION METHODS
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CHOICE AND JUSTIFICATION OF THE HEAT TRANSFER INTENSIFICATION METHODS

机译：传热强化方法的选择与合理化

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The methods of heat and mass transfer enhancement have been widely applied in the element of power equipment. The most popular methods of heat and mass transfer enhancement under convection are the use of the entry section effect, artificial flow agitation in the wall layer or over the entire flow section by circular or spiral grooves, dimples, finned surfaces, twisted tapes, screws and coiled pipes, jet impingement of heat carrier on a surface, porous and brush inserts, effect of ultrasonic vibrations, the influence of wall intensifiers of heat removal on laminar-flow heat transfer. To intensify heat transfer in boiling, extensive use is made of porous coatings, since the methods of artificial flow agitation are less efficient here. The enhancement of heat transfer in condensation is achieved by creating drop condensation, whereas in case of film condensation, knurling, finning, and alteration of the slope of the surface are employed to enhance heat transfer. Combined methods of heat transfer intensification are based on the use of at least two methods of increasing the heat removal intensity. For example,- the use of artificial roughness of the surface and of a twisted tape;- the use of helical pipe and of porous coating;- the use of circular knurling and flow twisting in helical pipes.The enhancement of heat and mass transfer make it possible to improve the equipment characteristics. Incorporation of grids-intensifiers into the structure of fuel assemblies made it possible to increase the power of energy block by a factor of 1.5. This new edition the survey of investigations in the field of heat and mass transfer enhancement on the macro-, micro-, and nanoscales. The available investigations into heat transfer and hydrodynamics of dimpled surfaces are considered in detail. Consideration is given on the thermohydrodynamics on the micro- and nanoscales: heat transfer under condensation on macro- and microrough surfaces, heat transfer with boiling on surfaces with porous coating and protrusions that form a homogeneous relief, heat transfer in the presence of convection in micro channels, the appearance of slipping on the wall in liquid flow over an ultrahydrofobic surface, the influence of molecular layers of surfactant formed on surfaces on the hydraulic resistance of pipelines.
机译：增强传热和传质的方法已广泛应用于电力设备中。对流下最常用的增强传热和传质的方法是使用入口截面效应，在壁层或整个流动截面上通过圆形或螺旋形凹槽，凹坑，翅片表面，扭曲带，螺钉和盘管，表面热载体的射流撞击，多孔和电刷插件，超声波振动的影响，除热壁增强器对层流传热的影响。为了加强沸腾中的热传递，多孔涂层被广泛使用，因为在此人工流搅拌方法效率较低。凝结过程中的热传递增强是通过产生液滴凝结来实现的，而在薄膜凝结的情况下，滚花，细化和改变表面的斜度可提高热传递。强化传热的组合方法是基于使用至少两种增加排热强度的方法。例如，-使用人造的表面粗糙度和扭曲的胶带;-使用螺旋管和多孔涂层;-在螺旋管中使用圆形滚花和流动扭曲。可以改善设备特性。将栅格增强器结合到燃料组件的结构中，可以将能量块的功率提高1.5倍。该新版本对宏观，微观和纳米尺度上的传热和传质增强领域的研究进行了调查。详细考虑了对凹坑表面的传热和流体动力学的研究。考虑了微米和纳米尺度的热流体动力学：宏观和微观粗糙表面在凝结下的传热，多孔涂层和凸起形成均匀浮雕的表面上沸腾的传热，微观对流存在下的传热通道，超疏水表面上液体流动时壁上滑倒的出现，表面上形成的表面活性剂分子层对管道的水力阻力的影响。

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