Research Article | OPEN ACCESS
Effect of Heat up Rate on Thermal Stratification in Horizontal Pipe
Athar Rasool, Sun Zhongning and Wang Jianjun
College of Nuclear Science and Technology, Harbin Engineering University, Harbin, Heilongjiang 150001, China
Research Journal of Applied Sciences, Engineering and Technology 2013 1:332-338
Received: June 28, 2012 | Accepted: July 19, 2012 | Published: January 01, 2013
Abstract
The study is performed to analyze the effects of heat up rate on thermal stratification phenomenon in pressurizer surge line. The horizontal section of pressurizer surge line is considered for this study since significant thermal stratification is usually observed in horizontal sections of the pressurizer surge line. The tendency of thermal stratification reduces with increasing flow rates based on which four cases of heat up rates with increasing flow velocities are analyzed. The selected flow velocities of 0.01, 0.05, 0.1 and 0.2 m/sec for the study are calculated from the operating range of dimensionless Froude number 0.02-0.2 of pressurized water reactor type nuclear power plants. The horizontal pipe model inner diameter is 305 mm with thickness of 33.5 mm and length of four diameters. The Richardson number for the four cases is greater than unity and thermal stratification is likely to occur. The transient analysis is performed using commercially available software ANSYS CFX. The transient temperature distribution along the horizontal pipe wall with different heat up rates is represented in this study. Thermal stratification reduces with increase in heat up rate or flow velocity.
Keywords:
Pressurizer surge line, reactor heat up rate, RNG K-Eturbulence model, thermel stratification,
Competing interests
The authors have no competing interests.
Open Access Policy
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Copyright
The authors have no competing interests.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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