Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Druckformat: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v26.i4.20
pages 287-303

EFFECT OF THERMAL−HYDRAULIC PARAMETERS ON ENTROPY GENERATION IN A BOILING CHANNEL

Saeed Talebi
Department of Energy Engineering and Physics, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, P.O. Box 15875-4413 , Tehran, Iran.

ABSTRAKT

In this study, the optimization of local entropy generation for water/vapor-saturated two-phase flow in a vertical channel is conducted using entropy generation minimization. The contributions of heat transfer and pressure drop to entropy generation is considered. Appropriate models for estimating heat transfer and pressure drop in a boiling channel are applied. The drift flux model is used to predict the void fraction along the boiling channel. The effect of influential thermal-hydraulic parameters such as the inlet quality, induced power, power distribution profile, channel hydraulic diameter, and inlet mass flux on channel entropy generation is presented. The optimum channel hydraulic diameter is predicted as a function of the system pressure. Also, an appropriate critical heat flux model is applied to the boiling channel to insure safety margin evaluation. It is found that an increase in system pressure decreases the optimized channel hydraulic diameter. For each flow condition, there is a mass flux at which the entropy generation rate is maximized. It was also observed that the channel power distribution profile has an important effect on the entropy generation of a boiling channel. Uniform power distribution is preferred for both minimum entropy generation and a wider margin of safety.


Articles with similar content:

Two-phase Flow Characteristics of Refrigerant Flows in a MicroChannel Heat Exchanger
Journal of Enhanced Heat Transfer, Vol.6, 1999, issue 6
T. S. Ravigururajan
VISUALIZED EXPERIMENT OF BUBBLE BEHAVIORS IN A NARROW RECTANGULAR CHANNEL UNDER NATURAL CIRCULATION CONDITION
International Heat Transfer Conference 16, Vol.20, 2018, issue
Shengzhi Yu, Tingting Ren, Kuan Yang, Changqi Yan, Meiyue Yan, Yongyong Yang
EFFECT OF SURFACE STRUCTURE ON VOID FRACTION OF SUBCOOLED FORCED BOILING IN RECTANGULAR NARROW CHANNEL
International Heat Transfer Conference 16, Vol.4, 2018, issue
Tomohiko Nakamura, Hitoshi Asano
3.6 Analysis of Critical Heat Flux in Steam-generating Channels by the Quasistatic Method
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 1980, issue
M. A. Styrikovich, V. S. Polonsky
NUMERICAL INVESTIGATIONS OF SUBCOOLED FLOW BOILING IN A PEBBLE BED
Second Thermal and Fluids Engineering Conference, Vol.43, 2017, issue
Liang-ming Pan, Wan Sun, Qiu-Wang Wang, Shanshan Bu, Jian Yang, Jie Wang