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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2012004325
pages 99-106

NUMERICAL SIMULATION OF HIGH-PRESSURE AND - TEMPERATURE WATER IN A 2 MM PIPE: WHAT IS THE CONDITION FOR THE RAPID INCREASE IN TEMPERATURE?

Yoshio Masuda
National Institute of Advanced Industrial Science and Technology (AIST), Miyagi Sendai 4-2-1, Nigatake, Miyagino-ku, Japan
Osamu Sato
National Institute of Advanced Industrial Science and Technology (AIST), Miyagi Sendai 4-2-1, Nigatake, Miyagino-ku, Japan
Takafumi Aizawa
National Institute of Advanced Industrial Science and Technology (AIST), Miyagi Sendai 4-2-1, Nigatake, Miyagino-ku, Japan
Masayuki Shirai
National Institute of Advanced Industrial Science and Technology (AIST), Miyagi Sendai 4-2-1, Nigatake, Miyagino-ku, Japan
Akira Suzuki
National Institute of Advanced Industrial Science and Technology (AIST), Miyagi Sendai 4-2-1, Nigatake, Miyagino-ku, Japan

ABSTRACT

A model of a supercritical water microreactor has been numerically simulated. The fluid flow with natural convection and temperature fields is calculated for four types of mixing patterns. Further, we discuss the fine mixing pattern for the rapid heating of a substrate. When forced convection is dominant, employing a method in which hot and cold water are mixed well yields good results. Further, it is preferable to avoid the case in which the inlet of the substrate is above the mixing point since natural convection reaches near the inlet of the substrate and the temperatures of the particles increase.


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