RANS Modeling of Turbulent Flow and Heat Transfer in a Droplet-Laden Mist Flow through a Ribbed Duct

被引：5

作者：

Pakhomov, Maksim A. ^{[1
]}

Terekhov, Viktor I. ^{[1
]}

机构：

[1] Russian Acad Sci, Kutateladze Inst Thermophys, Siberian Branch, Lab Thermal & Gas Dynam, Acad Lavrentev Ave 1, Novosibirsk 630090, Russia

来源：

WATER | 2022年 / 14卷 / 23期

基金：

英国科研创新办公室;

关键词：

droplet-laden flow; ribbed duct; heat transfer; evaporation; RANS; RSM; BACKWARD-FACING STEP; RECTANGULAR CHANNELS; MIST/STEAM; PARTICLES; TRANSPORT; EQUATION;

D O I：

10.3390/w14233829

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The local structure, turbulence, and heat transfer in a flat ribbed duct during the evaporation of water droplets in a gas flow were studied numerically using the Eulerian approach. The structure of a turbulent two-phase flow underwent significant changes in comparison with a two-phase flow in a flat duct without ribs. The maximum value of gas-phase turbulence was obtained in the region of the downstream rib, and it was almost twice as high as the value of the kinetic energy of the turbulence between the ribs. Finely dispersed droplets with small Stokes numbers penetrated well into the region of flow separation and were observed over the duct cross section; they could leave the region between the ribs due to their low inertia. Large inertial droplets with large Stokes numbers were present only in the mixing layer and the flow core, and they accumulated close to the duct ribbed wall in the flow towards the downstream rib. An addition of evaporating water droplets caused a significant enhancement in the heat transfer (up to 2.5 times) in comparison with a single-phase flow in a ribbed channel.

引用

页数：18

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