NUMERICAL SIMULATION OF HIGH-PRESSURE AND - TEMPERATURE WATER IN A 2 MM PIPE: WHAT IS THE CONDITION FOR THE RAPID INCREASE IN TEMPERATURE? - Computational Thermal Sciences: An International Journal, Volume 4, 2012, Issue 2 - Begell House Digital Library

Computational Thermal Sciences: An International Journal

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

Volume 4, Issue 2, 2012, pp. 99-106

DOI: 10.1615/ComputThermalScien.2012004325

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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.

KEY WORDS: mixing, numerical simulation, natural convection, quick heating process

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