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This paper presents an experimental study including visualization on a flat plate closed loop pulsating heat pipes.It consists of a total of 40 channels with square cross section(2 mm×2 mm,165 mm long) machined directly on an aluminum plate(180 mm×120 mm×3 mm) covered by a transparent plate.The working fluid employed is ethanol.As a result,various flow patterns and their transitions are observed and found to be related to the fluid fill ratio,input heat load and the device orientation.Also the operational c...  相似文献   
2.
Refrigeration coefficient, ε, is usually calculatedby using the First Law of Thermodynamics. In this paper, anew derivation process is introduced through the combinationof the Second Law of Thermodynamics with the First Law of Thermodynamics. As a result, two new calculationequations for refrigeration coefficient are proposed. Oneequation is equivalent to the common method, but its form isa little complicated for real calculation. Another equation is the further simplification, and can be used to calculate therefrigeration coefficient instead of common method with apermit error.  相似文献   
3.
By means of the Second Law of Thermodynamics,thispaper gives out the entropy analysis method for vapor-comperession refrigeration system.The thermal irrevers-ibility of the system charged with R12 and its hopeful al-ternative refrlgerant R134a have been studied respective-ly.On the basis of all the research results of this paper,the measure used to save energy for vapor-compressionrefrigeration system has been put out.  相似文献   
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脉动热管技术的研究现状及前沿热点   总被引:8,自引:0,他引:8  
脉动热管作为一种新型热管技术,具有结构简单、成本低廉和性能卓越的优点,在微电子元器件的冷却以及航空航天领域的热控制技术中极具应用和发展潜力。这里简单介绍了脉动热管技术的结构及工作原理;分析其运行特性和性能影响参数。在综合分析有关文献的基础上,明确了下一步研究工作的方向以及热点问题。  相似文献   
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介绍内融冰式冰蓄冷系统的蓄冰、融体传热计算数学模型,编制程序,计算冰层厚度、盐水出口温度、蓄冰桶效能、蓄(融)冰时间、蓄(释)冷量等参数,为设计提供依据.  相似文献   
6.
为了规范信息系统工程中数据库应用系统建设的监理过程,实现数据库应用系统建设的标准化,通过分析数据库建设监理的现有经验,结合信息系统工程监理的理论模式,在突出通用性的前提下,构造一套比较完整的数据库应用系统建设的监理评审工具.并且通过表格的形式将监理要点结构化,分数据库设计、安装与配置、备份与恢复以及安全等几部分,描述监理方法、风险及解决建议,并形成评审原则.  相似文献   
7.
杨洪海  Sameer  Khandekar  Sanka  V.  V.  S.  N.  S.  Manyam  Manfred  Groll 《东华大学学报(英文版)》2007,24(4):439-444
Mathematical modeling of pulsating heat pipes through 'first’ principles is a contemporary problem which remains quite elusive. Simplifications and assumptions made in all the modeling approaches developed so far render them unsuitable for engineering design. In this paper, a more realistic modeling scheme is presented which provides considerable try for thought toward the next progressive step. At high enough heat flux level, closed loop pulsating heat pipes experience a bulk internal unidirectional fluid circulation. Under such a condition, conventional two-phaseflow modeling in capillary tubes may be applied. This has been attempted for single-loop PHPs. A homogeneous model and a separated two-fluid flow model based on simultaneous conservation of mass, momentum and energy, have been developed for an equivalent 'open flow' system. The model allows prediction of two-phase flow parameters in each subsection of the device thereby providing important insights into its operation. The concept of 'void fraction constraint'in pulsating heat pipe operation is introduced and its relevance to future modeling attempts is outlined.  相似文献   
8.
采用文献[6]修正后的熵产生数定义式,在ε—NTU法基础上,进行换热器的熵产分析,推导出各种型式换热器通用的熵产生数计算公式,且形式简单,计算方便。  相似文献   
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IntroductionMeandering tube pulsating heat pipes(PHPs) , whichare very attractive entrants in the family of heat pipes ,have already found successful applications in cooling powerand microelectronics[1]due to their si mple structures ,costeffectiveness and excellent ther mal perfor mance .They alsohave a potential for ther mal control application for spaceand avionics . Since its introduction in1990 s researchactivity in this area has steady increased,including variousexperi mental studies an…  相似文献   
10.
介绍内融冰式蓄冰桶改进的数值计算模型.将盘管分成许多小段进行研究,考虑了蓄冷时冰层和释冷时水层间的连通现象及蓄冷期冰的温度变化和释冷期水温的变化.所得结果可为设计选用提供依据.  相似文献   
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