The effect of plate heat exchanger's geometry on heat transfer
01 Jan 2015-
TL;DR: In this paper, the influence of geometric characteristics of plates on the intensification process of heat exchange has been studied for two models of plate heat exchangers, and the authors examined the distribution of velocity and temperatures fields on active plate height.
Abstract: The study presents further Computational Fluid Dynamics (CFD) numerical analysis for two models of plate heat exchangers. Comparatively was studied the influence of geometric characteristics of plates on the intensification process of heat exchange. For this purpose, it was examined the distribution of velocity and temperatures fields on active plate height. Heat transfer characteristics were analysed through the variation of mass flow on the primary heat agent.
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TL;DR: In this article, local heat transfer and flow behavior for laminar and transitional flows in sinusoidal wavy passages are investigated, with special attention directed toward detecting the onset of macroscopic mixing in the flow.
293 citations
TL;DR: In this article, the effects of surface geometries of three different type heat exchangers called as PHEflat (Flat plate heat exchanger), PHEcorrugated (Corrugated plate Heat exchanger) and PHEasteriks (Asterisk plate heat exchangeanger) were investigated experimentally.
106 citations
TL;DR: In this article, the hydrodynamic characteristics and distribution of flow in two cross-corrugated channels of plate heat exchangers have been investigated, and the velocity, pressure and flow distribution of the fluid among the two channels of the plate heat exchange has also been presented.
104 citations
TL;DR: In this paper, the authors used the finite element computational fluid dynamics program POLYFLOW® to analyze laminar flows in double-sine chevron-type PHEs passages.
Abstract: Laminar or low Reynolds number flows are usually obtained when liquid foods with high viscosity are processed in plate heat exchangers (PHEs). The tortuosity coefficient is a key parameter used by PHEs manufacturers to estimate Fanning friction factors and convective heat transfer coefficients. Using the finite-element computational fluid dynamics program POLYFLOW®, fully developed laminar flows in double-sine chevron-type PHEs passages are analysed in this work. The corrugation angle and channel aspect ratio of the passages vary in a broad range, PHEs with common area enlargement factors and with high area density being studied. The tortuosity coefficient and the coefficient K (Kozeny's coefficient in granular beds) from the friction factor correlations increase with the increase of the channels aspect ratio and the decrease of the chevron angle. The shape factor from the PHEs passages also increases with the decrease of the chevron angle and is weakly influenced by the channel aspect ratio. In this paper, relations to predict the tortuosity coefficient and shape factor are proposed, the coefficient K being predicted resorting to the tortuosity coefficient and shape factor. The coefficient K compares well with literature data in the region of common chevron angles, channels aspect ratio and area enlargement factor.
76 citations
TL;DR: In this article, a predictive model has been presented to suggest the transient response of plate heat exchangers, subjected to a step flow variation, and the results indicate that flow maldistribution affects the performance of the plate heat exchange in the transient regime.
56 citations
"The effect of plate heat exchanger'..." refers background in this paper
...257 model is a complex combination of the other two models (k - ω) and (k - ε), with a function that activates model (k - ω) in areas of wall and (k - ε) model in central areas, thus benefit from the advantages of the two models into one, [4]....
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