wall Superheat Excursions in the Boiling incipience of Dielectric Fluids
TL;DR: In this paper, a brief review of the mechanisms that may be responsible for delayed nucleation and examines the limited literature on incipience superheat excursions is presented. But the authors do not consider the effect of temperature variations on the nucleation of microelectronic components.
Abstract: Many of the candidate fluids for immersion cooling of microelectronic components possess both low surface tension and high gas solubility. As a consequence, ebullient heat transfer with such fluids is accompanied by nucleation anomalies and a frequently observed wall temperature overshoot. The difficulty in preventing this thermal excursion and in predicting its magnitude constrains the development of immersion cooling systems. This paper begins with a brief review of the mechanisms that may be responsible for delayed nucleation and examines the limited literature on incipience superheat excursions.
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TL;DR: In this article, the authors deal with aspects of the complexity of mechanical properties of porous structures made from copper fibers and fibers reinforced with copper meshes to assess the adhesive strength of the fibrous structure and the cohesion between the components of the tested elements used for the construction of heat exchangers.
Abstract: The paper deals with aspects of the complexity of mechanical properties of porous structures made from copper fibers and fibers reinforced with copper meshes to assess the adhesive strength of the fibrous structure and the cohesion between the components of the tested elements used for the construction of heat exchangers. All of the tested samples were characterized by macroscopic open porosity. The internal structure of the obtained connections was analyzed by metallographic techniques. Statistical relations of the connections made between the layers have been provided. The side effects of the production technology related to the “hydrogen disease” of copper have been discussed.
1 citations
01 Jan 1988
TL;DR: In this paper, the thermal aspects of an immersion-cooled computer designed to operate at cryogenic temperatures are discussed, including the selection of a working fluid, determination of the mode, or modes, of heat transfer to be employed, and selection, or development, of any required heat transfer correlations.
Abstract: This work addresses the thermal aspects of an immersion-cooled computer designed to operate at cryogenic temperatures. Several of the major thermal design issues are discussed in detail. These include: (1) the selection of a working fluid, (2) the determination of the mode, or modes, of heat transfer to be employed, (3) the selection, or development, of any required heat transfer correlations, and (4) the selection of a refrigeration system. The results of a preliminary analysis of a candidate thermal control system are also presented.
1 citations
Dissertation•
01 Jan 2011
TL;DR: In this article, acknowledgement is given for the work presented in this article.i Acknowledgement iiiiii Acknowledgements iii.1.2.3.4.
Abstract: i Acknowledgement iii
1 citations
01 Jan 2002
TL;DR: In this paper, the warmwasserbereitung in einem Topf auf einem “Herd” wohl the praktisch bedeutsamste verfahrenstechnische Grundoperation.
Abstract: Seit der “Erfindung” des Feuers ist die Warmwasserbereitung in einem Topf auf einem “Herd” wohl die praktisch bedeutsamste verfahrenstechnische Grundoperation. Dennoch ist ihre detaillierte quantitative Beschreibung insbesondere fur den Fall hoherer Warmestromdichten bis heute nicht zufriedenstellend moglich.
Journal Article•
TL;DR: The Web of Science Record was created on 2005-07-06, modified on 2016-08-08 by as discussed by the authors, with the purpose of preserving a record of the 2005 LTCM-ARTICLE-2005-040
Abstract: Reference LTCM-ARTICLE-2005-040View record in Web of Science Record created on 2005-07-06, modified on 2016-08-08
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Book•
01 Jan 1994
TL;DR: In this paper, the basic models of two-phase flow are discussed and empirical treatments of two phase flow are provided. But the authors focus on convective boiling and condensing.
Abstract: Introduction 1. The basic models 2. Empirical treatments of two-phase flow 3. Introduction to convective boiling 4. Subcooled boiling heat transfer 5. Void fraction and pressure drop in subcooled boiling 6. Saturated boiling heat transfer 7. Critical heat flux in forced convective flow - 1. Vertical uniformly heated tubes 8. Critical heat flux in forced convective flow - 2. More complex situations 9. Condensation 10. Conditions influencing the performance of boiling and condensing systems 11. Multi-component boiling and condensation Appendix Index
2,426 citations
TL;DR: In this article, a regression analysis was applied to the nearly 5000 existing experimental data points for natural convection boiling heat transfer, which can best be represented by subdividing the substances into four groups (water, hydrocarbons, cryogenic fluids and refrigerants) and employing a different set of dimensionless numbers for each group of substances.
710 citations
Book•
01 Jan 1983
TL;DR: In this article, thermal analysis and control of electronic equipment, thermal analysis of electronic devices and their control, thermal control and control in the field of software engineering, is discussed. ǫ
Abstract: Thermal analysis and control of electronic equipment , Thermal analysis and control of electronic equipment , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
339 citations
TL;DR: A survey of the evolution of surface geometries that promote high-performance nucleate boiling can be found in this paper, where the authors survey the development of a high area density of stable nucleation sites whose performance does not deteriorate with time.
Abstract: This paper surveys the evolution of special surface geometries that promote high-performance nucleate boiling. Early work by Jakob and Fritz in 1931 showed that emery paper roughening or machined grooves provided only temporary performance increase. However, this improvement dissipated after a few days to the flat surface value. There was little sustained interest in this unique, but apparently unuseful, phenomenon until the mid-1950s. During the period 1955-1965, supporting fundamental studies of the character and stability of nucleation sites provided a basis for renewed efforts to develop a high area density of stable, artificially formed nucleation sites whose performance does not deteriorate with time. Beginning in 1968 industrial research produced patented technology that achieved the long-sought goal. In 1980 at least six high-performance nucleate boiling surfaces were commercially available. The technology reported in this paper represents a dramatic advance in the field of heat transfer.
192 citations