High Performance Cooling with Boiling Heat Transfer in Confined or Low Level Water Space
在密闭或低位水空间中通过沸腾传热进行高性能冷却
基本信息
- 批准号:63550151
- 负责人:
- 金额:$ 1.41万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (C)
- 财政年份:1988
- 资助国家:日本
- 起止时间:1988 至 1989
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This research consists of two main subjects. The one is on the boiling heat transfer enhancement by means of confining the boiling space, and the other is on the boiling heat transfer to low leveled water.An experiment on pool boiling on a circular copper surface in water was performed for a case in which the boiling space was restricted by an adiabatic interference plate with many holes. The space between the heat transfer surface and the interference plate was hermetically sealed at the perimeter to simulate a large surface of heat transfer. Therefore, the vapor and liquid were exchanged through the holes in the interference plate.Many boiling curves were obtained, and appearances were observed for many distributing patterns of holes on the interference plates. High heat fluxes were obtained in the narrow space at a small surface superheat of less than 1K. The interference plate of high heat transfer performance was found which was comparable with other available boiling heat transfe … More r surfaces of high performance. In water, the best performance was given by the interference plate with two types of holes, i.e., 4mm and 1mm in diameter, if it was set 0.12mm above the surface.Next, boiling heat transfer enhancement were confirmed for low level of water not only in low heat flux region of nucleate boiling, but also at maximum heat flux. The former enhancement came from violent evaporation of thin water film under vapor domes. The latter arose from not forming vapor lumps over the surface in such low leveled liquid, which resulted in steady and successive supply of water from circumference.Several factors which should be considered to affect on heat transfer performance through supply of water to heat transfer surface was examined. The size of boiling vessel and the wetability of the surface had only little influence on heat transfer. But the size of heat transfer surface decisively affected on heat transfer, especially in high heat flux region. A small surface could release much higher maximum heat flux in low level of water than in sufficiently deep water, e.g. 8mm diameter surface showed 1.47 times of pool boiling maximum heat flux at the level of 1.0mm. The surface of 26mm diameter showed only a little increase of maximum heat flux in low leveled water.Conical surfaces were also examined changing the apex angle from 180゚ to 160゚. Steady nucleate boiling was maintained even at 0mm of water level (measured at the top of the cone) with 160゚ cone, which is very comfortable character for practical use. Conical surface of 160゚ and 170゚ in apex angle showed increased maximum heat flux comparing with a flat surface, though the difference was not so large. Less
本研究包括两个主要课题。一个是通过限制沸腾空间来增强沸腾传热,另一个是对低水位水的沸腾传热。在沸水空间受多孔绝热干涉板限制的情况下,对圆形铜表面进行了池沸实验。传热表面与干涉板之间的空间在周长处密封,以模拟一个大的传热表面。因此,蒸汽和液体通过干涉板上的孔进行交换。得到了许多沸腾曲线,并在干涉板上观察到许多孔的分布模式。在小于1K的小表面过热度下,在狭窄的空间内获得了较高的热流密度。该干涉板具有较高的传热性能,可与其他沸水传热表面相媲美。在水中,直径为4mm和1mm两种孔径的干涉板在距水面0.12mm处的表现最佳。其次,证实了低水位水对沸腾换热的强化作用,不仅存在于核沸腾低热流密度区域,而且存在于最大热流密度区域。前者的增强来自于蒸汽圆顶下薄水膜的剧烈蒸发。后者的原因是在这种低水平的液体中,没有在表面形成蒸汽团块,这导致了水从周围稳定而连续地供应。研究了影响换热面供水换热性能的几个因素。沸腾容器的尺寸和表面的润湿性对传热影响不大。但换热面大小对换热有决定性的影响,特别是在高热流密度区域。较小的表面在低水位释放的最大热流密度要比在足够深的水中释放的大得多,例如直径8mm的表面在1.0mm水位释放的最大热流密度是池沸腾的1.47倍。在低水平面,直径26mm表面的最大热流密度仅略有增加。锥形表面的顶点角从180到160也进行了测试。在160锥的情况下,即使在0毫米的水位(锥顶测量)也能保持稳定的核沸腾,这在实际使用中是非常舒适的。160和170个顶点角的锥形表面与平面相比,最大热流密度增加,但差异不大。少
项目成果
期刊论文数量(10)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
R.SHIMADA, J.KOMAI, Y.HIRONO, S.KUMAGAI, T.TAKEYAMA: "Boiling Heat Transfer in a Narrow Space Restricted by an Interference Plate with Holes" Trans. Japan Soc. Mech. Eng. (B) Vol.55-No.515, 2035-2040(1989).
R.SHIMADA、J.KOMAI、Y.HIRONO、S.KUMAGAI、T.TAKEYAMA:“受带孔干涉板限制的狭窄空间内的沸腾传热”Trans。
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- 影响因子:0
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- 通讯作者:
M.TONG, Y.HIRONO, R.SHIMADA, S.KUMAGAI, T.TAKEYAMA: "Boiling Heat Transfer to Low Level Water (2nd Rept. Conical Boiling Surface and a Bubble Extinction Pin)" Proc. 25th National Heat Transfer Conf. Vol.2, 292-294(1988).
M.TONG、Y.HIRONO、R.SHIMADA、S.KUMAGAI、T.TAKEYAMA:“沸腾传热至低位水(第二次圆锥形沸腾表面和气泡灭绝销)”Proc。
- DOI:
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- 影响因子:0
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- 通讯作者:
M.ARAKAWA, R.SHIMADA, S.KUMAGAI: "Boiling Heat Transfer from Comparatively Small Surfaces to Low Leveled Water" Proc. 27th National Heat Transfer Conf.
M.ARAKAWA、R.SHIMADA、S.KUMAGAI:“从相对较小的表面到低位水的沸腾传热”Proc。
- DOI:
- 发表时间:
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- 影响因子:0
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- 通讯作者:
島田了八,駒井淳,広野洋一,熊谷哲,武山斌郎: "多孔干渉板により制限された極小間げき内の沸騰熱伝達とその促進" 日本機械学会論文集. 55. 2035-2040 (1989)
Ryohachi Shimada、Jun Komai、Yoichi Hirono、Satoshi Kumagai 和 Binro Takeyama:“多孔干扰板限制的最小间隙内的沸腾传热及其促进”日本机械工程师学会汇刊 55。2035-2040(1989 年)。 )
- DOI:
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- 影响因子:0
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M.TONG, Y.HIRONO, R.SHIMADA, S.KUMAGAI, T.TAKEYAMA: "Boiling Heat Transfer to Low Level Water (1st Rept. Unsteady State Boiling in Cyclically Changing Level)" Proc. 25th National Heat Transfer Conf. Vol.2, 289-291(1988).
M.TONG、Y.HIRONO、R.SHIMADA、S.KUMAGAI、T.TAKEYAMA:“沸腾传热至低位水(第 1 次报告。循环变化水平下的非稳态沸腾)”Proc。
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KUMAGAI Satoshi其他文献
KUMAGAI Satoshi的其他文献
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{{ truncateString('KUMAGAI Satoshi', 18)}}的其他基金
A study on Innovation Enabling Management Method
创新赋能管理方法研究
- 批准号:
16510124 - 财政年份:2004
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$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
On the Occurrence, Stability and Heat Transfer Enhancement of Microbubble Emission Boiling
微气泡发射沸腾的发生、稳定性及强化传热研究
- 批准号:
13650206 - 财政年份:2001
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$ 1.41万 - 项目类别:
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On the Bubble Behavior and Heat Transfer Mechanism in Microbubble Emission Boiling
微气泡发射沸腾中的气泡行为及传热机理研究
- 批准号:
09650219 - 财政年份:1997
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$ 1.41万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
On the Heat Transfer Mechanism and Stability of High Heat Flux Microbubble Emission Boiling
高热通量微泡发射沸腾传热机理及稳定性研究
- 批准号:
05805021 - 财政年份:1993
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Grant-in-Aid for General Scientific Research (C)
Mechanism and Optimization of Enhancement of Filmwise Condensation Heat Transfer by Coexistence With Dropwise Condensation Sections
滴状冷凝段共存增强膜式冷凝传热机理及优化
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02650144 - 财政年份:1990
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$ 1.41万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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