AN INVESTIGATION OF THE ENHANCEMENT OF HEAT TRANSFER AS QUICK COOLING OF THE HEATED PLATE

加热板快速冷却强化传热的研究

• 批准号: 06650271
• 负责人: MATSUMOTO Kenichi
• 金额: $ 1.09万
• 依托单位: KURUME NATIONAL COLLEGE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650271/
• 关键词: heat transfer enhancement; boilin heat transfer; cooling; quenching; vapor explosion; 急速冷却; 沸騰伝熱促進・制御; 沸騰特性曲線

In case of cooling of hot plate by the coolant, the hot plate is covered with the vapor layr when it was heated to high temperature. Consequently, the reduction of heat transfer from the hot plate is produced by means of the thermal resistance of vapor layr. The object of our investigation is to find the meth- ods of the enhancement of heat transfer by making of disturbance to the vapor layr and to increase the cooling effects of the hot plate.(1) On the ralation of the chemical properties and the stability of the liquid-vapor interfaceThe vibration of liquid-vapor interface is affected by the interfacial tension of liquid. The kinetic instability theory of liquid-vapor interface gives some suggestions an influence of the interfacial tension. An experimental investigation of the effects of interfacial tension carried out by addition of a surface active agent into the coolant (water). It has been definitely shown by experiments that the addition of a surface active agent has a favorable influence upon the existence of vapor layr. In case of addition of a surface active agent, the film boiling are maintaining at low heat flux region and the vapor layr has been existed for any length of time. Although we expected initialy that an lower interfacial tension accelerates the touch of the liquid to the hot plate surface.(2) On the effect of the hot plate surface roughnessWe have investigated the effect of sourface roughness of hot plate and found that large roughness or contaminations on sourface made easy to contact of coolant and surface. The metal wire nets covered on the plate, especially, disturbed the existence of the vapor film layr.

如果冷却液冷却热板，当将蒸气板加热到高温时，热板覆盖了蒸气板。因此，通过蒸气层的热电阻产生了从热板中的热传递。我们调查的目的是通过对蒸气Layr进行干扰并增加热板的冷却效应来找到增强热传递的方法。（1）液体互动界面的液体互动界面的液体互动振动对化学性质的涂层以及液体间的稳定性受到了液体互动的影响。液体蒸气界面的动力学不稳定性理论给出了一些界面张力的影响。通过将表面活性剂添加到冷却剂（水）中进行的界面张力的影响的实验研究。实验肯定表明，添加表面活性剂对蒸气layr的存在有利。如果添加表面活性剂，则沸腾的沸腾保持在低热通量区域，并且在任何时间长度上都存在蒸气层。尽管我们期望首先，较低的界面张力会加速液体的触感到热板表面。（2）在热板表面粗糙度的效果上，我们研究了热板的最初粗糙度的效果，发现大型粗糙度或污染物对源的源，使其易于接触冷却液和表面。金属线网覆盖在板上，尤其是干扰了蒸气膜Layr的存在。