Han Yong , Jiani Li , Bingjun Li , Fanlin Meng , Xuehong Wu , Tingxiang Jin , Yunquan Li , Yonggang Wu
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引用次数: 0
Abstract
In this study, the heat transfer and flow resistance characteristics of a trifoliate petal twisted helically coiled tube (TPTHCT) were numerically studied. First, a mathematical model of the TPTHCT was established and the enhanced heat transfer mechanism was analyzed. Secondly, the TPTHCT and the smooth helically coiled tube (SHCT) were comparatively investigated mainly on the parameters of heat transfer coefficient (h), pressure drop (|Δp|), heat transfer effectiveness (ε), and heat transfer exergy loss number (ξHT). Finally, a Multi-Objective Genetic Algorithm (MOGA) was utilized to optimize the TPTHCT. The results indicate that an additional torsional force exists in the TPTHCT, which causes a more complex flow state and makes the temperature distribution more uniform. For the same working condition, h increased (by a maximum of 40 %), |Δp| increased (by a minimum of 50 %). ξHT consistently exhibited an opposite variation trend with ε at the same inlet temperatures ratio (τ); further ξHT can describe the effect of changes in τ, whereas ε cannot. The best result from the optimization was achieved with the objective function being maximum h, minimum |Δp|, and minimum ξHT; and the optimal structural parameters were Rco = 25.1 mm, P = 93.2 mm, di = 8.8 mm, r2 = 0.3, θ = 432°, a = 0.16, E = 151 mm.
期刊介绍:
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.