Heat and Mass Transfer, ( ISI ), No (45), Year (2009-7) , Pages (1185-1198)

Title : ( The effects of rate of expansion and injection of water droplets on the entropy generation of nucleating steam flow in a Laval nozzle )

Authors: Ali Reza Teymourtash , Javad Abolfazli Esfahani , Seyed Ali Mousavi Shaegh ,

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The entropy generation due to irreversible heat transfer between vapor and liquid phases in a nucleating steam flow in a Laval nozzle is studied. To calculate the entropy generation due to self-condensation in transonic steam flow, a thermodynamic model is presented. The calculations of nucleating steam flow and the predictions of entropy generation rely on one-dimensional two-phase model. This model shows that the most of the thermodynamic losses take place during the nucleation phenomena. The effect of rate of expansion on the exergy losses is considered by decreasing the divergent angle of nozzle. Also micro-sized pure water droplets is injected theoretically to supercooled steam right after the nozzle throat at the onset of divergent section and the effects of injected droplets on thermodynamic losses and nucleation phenomena are investigated. The results indicate that decreasing the divergent angle and also injection of droplets diminishes the pressure rise in transonic steam flow and decreases the thermal entropy generation due to nucleation.

Keywords

, droplet, nucleating, entropy
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@article{paperid:1011106,
author = {Teymourtash, Ali Reza and Abolfazli Esfahani, Javad and Mousavi Shaegh, Seyed Ali},
title = {The effects of rate of expansion and injection of water droplets on the entropy generation of nucleating steam flow in a Laval nozzle},
journal = {Heat and Mass Transfer},
year = {2009},
number = {45},
month = {July},
issn = {0947-7411},
pages = {1185--1198},
numpages = {13},
keywords = {droplet; nucleating; entropy generation},
}

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%0 Journal Article
%T The effects of rate of expansion and injection of water droplets on the entropy generation of nucleating steam flow in a Laval nozzle
%A Teymourtash, Ali Reza
%A Abolfazli Esfahani, Javad
%A Mousavi Shaegh, Seyed Ali
%J Heat and Mass Transfer
%@ 0947-7411
%D 2009

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