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Design And Technology Of Heat Pipes For Cooling And Heat

This book describes the characteristics of heat pipes under steady-state and transient operating conditions. It emphasizes the physical aspects of heat pipe behavior and develops design formulas on the basis of mathematical models and empirical observation. The author take a tutorial approach, presenting information on the application of heat pipe technology, design methods, and data to heat Design and fabrication of sintered wick for miniature Design and fabrication of sintered wick for miniature cylindrical heat pipe based on phase change, heat pipe essentially consists of 3 parts:sealed container, working fluid and wick. The wick such as capillary limit, boiling limit, entrainment limit, sonic limit, viscous limit [25]. For copperwater cylindrical heat pipes

Design and manufacture of ceramic heat pipes for high

In this report, the design of a ceramic heat pipe based on a multi-layer concept is presented. It comprises a ceramic cladding tube containing a metal tube filled with a working fluid. The possibility of manufacturing single heat pipes by sealing the ceramic tubes with laser brazing and a glass solder has been described and demonstrated. Entrainment Limits in Heat Pipes AIAA JournalEntrainment Limits in Heat Pipes. Design and manufacture of ceramic heat pipes for high temperature applications. Analysis of the critical Weber number at the onset of liquid entrainment in capillary-driven heat pipes. International Journal of Heat and Mass Transfer, Vol. 38, No. 8. Experimental Studies On Porous Wick Flat Plate Heat Pipeheat pipe like viscous, sonic, capillary, entrainment and nucleate boiling levels. Among various limitations, the lowest limitation such as capillary limitation in this study is considered as one of the important heat transport limitation. In the heat pipe design, a high value of surface tension is desirable in order to enable the heat pipe to

HTPIPE:A steady state heat pipe analysis program - NASA/ADS

A steady state heat pipe analysis computer program has been developed as an aid in the design of high performance heat pipes. The program is the result of a major revision of a previous version used at Los Alamos National Laboratory (LANL), which calculated the capillary, sonic, and entrainment performance limits, as well as pressure and temperature profiles for a specified power throughput Heat Pipe Limits Advanced Cooling Technologies, Inc.As shown in Table 1, there are five primary heat pipe transport limitations that must be considered during design:viscous, sonic, capillary, entrainment/flooding and boiling; see Table 1. These limits are a function of many variables including operating temperature, wick selection and fluid properties. Heat Pipes & Vapor Chambers Design GuidelinesHeat Pipe 1-Piece Vapor Chamber 2-Piece Vapor Chamber 20 Heat Pipes Bend radius 3X diameter of heat pipe. Each 45 degree bend reduces Qmax by ~2.5% Flatten to 1/3 diameter of original pipe (typical) Machining if pipe wall thickness permits. Allows direct contact with heat source 1-Piece Vapor Chamber 10mm bend radius along narrow plane

Heat Pipes:Theory, Design and Applications, Reay, David

* Long established as the standard work on heat pipes * Suitable for use as a professional reference and graduate text; contains all information required to design and manufacture a heat pipe * Revised with greater coverage of key electronics cooling application and a new design guide Heat pipes are used in a wide range of applications, including electronics cooling, die-casting and injection Theoretical Design and Analysis of Gravity Assisted Heat design of gravity assisted heat pipes. The variation of the heat Viscous Limit, Entrainment Limit, Capillary Limit and Boiling Limit; that are calculated for different cases of heat 4. Capillary limit:The heat transfer capacity based on ability of wick to pump the liquid back to the evaporator section. This limit depends on the wick Theoretical Design of Radiator using Heat PipesTheoretical Design of Radiator using Heat Pipes Archit Deshpande Entrainment limit ( ):The maximum heat flux after which the rising vapour starts to entrain ( ):The heat transfer capacity based on ability of wick to pump the liquid back to the evaporator section. This limit depends on the wick permeability and properties of working

Things to Consider When Designing With Heat Pipes Enertron

For example, the liquid ammonia heat pipe has a temperature range from -70 to +60C and is compatible with aluminum, nickel, and stainless steel. The liquid ammonia heat pipe has been widely used in space and only aluminum vessels are used due to its lighter weight. Water heat pipes, with a temperature range from 5 to 230C, are most effective for electronic cooling applications and copper vessels are Things to Consider When Designing With Heat Pipesarea of a heat pipe is the direct function of both the sonic and entrainment limit of the heat pipe. But as previously mentioned, the groove heat pipe, with the lowest capillary limit, works best under gravity-assisted conditions where the evaporator is Based on all of the designing criteria and limitations of the heat pipes, designing Design of heat pipe based on capillary and entrainment Any heat pipe design should be made based on the Limitations out of which few are Non-failure and the rest are failure. Such are Capillary and Entrainment Limitations which need be addressed sensit