Critical Phenomena in Miniature Passages with Micro Grooves During Vaporization under Forced Convection and/or Capillary Action

强制对流和/或毛细管作用下汽化过程中带微槽的微型通道的临界现象

• 批准号: 9706706
• 负责人: Amir Faghri
• 金额: $ 12.02万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706706&HistoricalAwards=false
• 关键词: Critical; Phenomena; Miniature; Passages; Micro

ABSTRACT This proposal deals with boiling heat transfer in miniature passages that have micro grooves. The miniature passages are rectangular channels with a hydraulic diameter of about 2 mm. There can be sub-millimeter size microgrooves on the inner surfaces of the channels. Experiments using channels with and without microgrooves will be conducted under conditions that will allow the effects of forced convection and capillary action to be delineated. Data to be collected include critical heat fluxes, pressure drops, and thermal resistances for various operating pressures and mass flow rates. Flow visualization will be performed to obtain relevant transport information such as the average lengths and velocities of liquid slugs and vapor bubbles. Mathematical modeling will be carried out to establish the relevant mechanisms for the heat transfer process.

摘要 该提案涉及具有微凹槽的微型通道中的沸腾传热。 微型通道为水力直径约2mm的矩形通道。 通道的内表面上可以有亚毫米尺寸的微槽。 使用带或不带微槽的通道进行的实验将在能够描述强制对流和毛细管作用效果的条件下进行。 要收集的数据包括各种工作压力和质量流量的临界热通量、压降和热阻。 将进行流动可视化以获得相关的传输信息，例如液塞和蒸汽泡的平均长度和速度。 将进行数学建模来建立传热过程的相关机制。