周期性变截面微通道内气液两相流动与沸腾传热特性研究

项目名称： 周期性变截面微通道内气液两相流动与沸腾传热特性研究

项目编号： No.50876003

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 电工技术

项目作者： 夏国栋

作者单位： 北京工业大学

项目金额： 39万元

中文摘要： 进入新世纪以来，随着微加工技术的日臻完善，国际传热学界已经开始着手迎接新的挑战，即发展结构更为复杂的第二代微通道传热技术，周期性变截面微通道便是其中的一种。一方面，截面面积的周期性变化能够周期性中断热边界层，使换热得到强化；另一方面，截面面积的周期性变化可以改变汽液两相流流型，进而对流动与传热特性产生重要影响。尽管大量有关传统型等截面微通道的研究结果为周期性变截面微通道的研究提供了很多有价值的参考信息，但是人们尚不清楚传统等截面微通道内流体沸腾传热特性的研究结果是否适用于周期性变截面微通道，很多问题需要通过深入研究予以澄清。为此，本课题申请拟对周期性变截面微通道内气液两相流动与传热特性进行深入的研究，其目的是研究微通道截面形状及尺寸、截面变化周期及幅值、流线变化、流体速度、流体物性以及流体引入方式等一系列参数对流体流动与传热特性的影响，进而指导周期性变截面微通道热沉的优化设计。

中文关键词： 传热；流型；气液两相流；周期性变截面微通道

英文摘要： With the gradual perfection of micromachining technology in the new century, the area of the international heat transfer has begun to meet new challenge, that is, developing the second-generation micro-channel heat transfer technolgy, which structure is more complex. The microchannel with periodic variation of transverse cross section area is one of them. On one hand , as the cross sectional area of the micro-channnel changing periodically, the boundary layer will be intermitted periodically, which can enhance heat transfer; On the other hand, the periodic variation of transverse cross section area will influence the gas-liquid two-phase flow pattern, and then exert important effects on the properties of the flow and heat transfer. Although a great deal of results, made by traditional microchannel with constant transverse cross section, provide many valuable information for microchannel with periodic variation of transverse cross section, we are still unclear whether the results of the characteristics of the flow boiling heat transfer from traditional mirochannel can be suitable for periodic variable section. A lot of questions should be clarfied through further research. Therefore ,this project has further studied on the properties of the single-phase and gas-liquid two-phase flow and heat transfer in the microchannel with periodic variable section. The purpose is to study on the effect of a series of parameters on the properties of the flow and heat transfer, such as the shape and size of miro-channel, the variation of transverse cross section area, the change of flow field, fluid velocity and properties, etc. The results will be used to optimize design of the periodic variable section mirochannel heat sink.

英文关键词： Heat transfer; Flow pattern;Gas-liquid two-phase flow;Microchannels with periodic variation of transverse cross section area.