| Project/Area Number |
07650230
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | MURORAN INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
KISHINAMI Koki Muroran Institute of Technology, Dept.of Mech.Engr., Prof., 工学部, 教授 (10002891)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Jun Muroran Institute of Technology, Dept.of Mech.Engr., Assist., 工学部, 助手 (20241408)
KISHINAMI Koki Muroran Institute of Technology, Dept.of Mech.Engr., Prof. (10002891)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1995: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Foam Fluid / High Viscous Fluid / Gas and Liquid Two Phase Fluid / High Temperature Heat Transfer / Surface Tension / Thermal Radiation / Boiling Heat Transfer / Tempering / Annealing of Steel |
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| Research Abstract |
In the processing of the heat treatment of the steel such as tempering/annealing, it is most important factor to control the cooling rate of the process for guaranteeing the quality.
In this study, heat transfer behaviors of the foam fluid were to examine experimentally for controlling the cooling rate of the steel heat treatment under wide condition of the temperature range from 100ﾟC to 900ﾟC,applying by the foam characteristic which is capable to change the water-air content ratio, i.e., to be possible to change the heat transfer coefficient from air to water. Transient heat transfer characteristics of foam flowing on a horizontal single tube and stagger/in lined arrayd tubes in 9.2mm dia.were cleared as follows ;
(1) Approximately constant heat flux of 10^5 W/m^2 from heating surface of the cylinder to the foam flow was observed regardless of the heating temperature condition of this study.
(2) The visual observation of the foam flowing is the followings ; (a) Within the excess temperature 10ﾟC,the convection foam fluid is always contact to the heating surface of the tube. (b) Ranging from 100ﾟC to 200ﾟC excess temperature, the foam fluid approaching to the heating surface is apt to disappear by rapid evaporating, and to be unstable flow with enlargement of the foam under the complex convection of the generated steam flow and evaporating. (c) Over the excess temperature 500ﾟC,it is observed that the foam fluid near the tube is enlarged the diameter and evaporated rapidly by the thermal radiation from the surface, and is separated by a space with superheated steam.
(3) Interference effect of the stagger/in-lined arrangement of the horizontal cylinders in the foam flowing on heat flux is recognized slightly on the downstream one at high excess temperature, but not recognized at the low excess temperature and the horizontal array arrangement.
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