Engineering design guide for heat sinks and heat pipes. Packed with examples and design information, it takes youthrough the background and. For example, there is an analogy between micro heat pipe operation and functioning of a sweat gland. Design considerations when using heat pipes electronics. It is only a conduit through which heat can be moved from one point to another with a low thermal resistance. Aug 14, 2015 with the increasing illumination intensity of leds, thermal management became a critical issue in its design. Boiling heat transfer characteristics of nanofluids in a flat heat pipe evaporator with microgrooved heating surface international journal of multiphase flow, vol. Taking advantage of the large difference between the dielectric constants of liquid and vapor, the integrated capacitor can be used for voidfraction measurements in twophase flows. For example, choice of the wick and case material eliminates many candidate working fluids often including water due to. This book provides a practical study of modern heat pipe engineering, discussing how it can be optimized for use on a wider scale. The vapor pressure decreases as it flows from the evaporator to the condenser. Then, other emerging memsbased microheat pipes, such as.
Heat pipe design methodologies and manufacturing considerations applications for cooling both electrical and mechanical systems the full range of heat pipe classifications, including rotatingand revolving, micro, cryogenic, and variable conductance heatpipes, as well as thermal diodes and switches. In this paper, an led module integrated with a micro heat pipe and heat sink was designed and fabricated. The vapor then travels along the heat pipe to the cold interface. Heat pipe design and modeling heat pipe manufacturer. This new edition has been revised to include new information on the underlying theory of heat pipes and heat transfer, and features fully updated applications, new data sections, and updated. Opentype mini micro heat pipes are suggested in, as a system of thermal control of biological objects and drying technology. Peter kew first became involved in heat pipes in the late 1970s as a research officer with international research and development working on a range of heat transfer and energy conservation projects, including heat pipe development which was then led by david reay. Experiments and analyses of flat miniature heat pipes. Advanced thermal solutions air flow ats azar cfd cold plates consulting convection cooling education electronics electronics cooling engineering fan fan characterization heat exchangers heat pipe heat pipes heat sink heat sink attach heat sink design heat sinks heat transfer kaveh azar led led lighting liquid. Accordingly, furukawa electric has been marketing heat sinks that incorporate micro heatpipes since 1995. This work focuses on recent applications of heat pipes in electronics industry. Integrated microheatpipe fabrication technology ieee. An attempt is made to design, fabricate and test a miniature heat pipe with 5 mm diameter and 150. Opentype minimicro heat pipes are suggested in, as a system of thermal control of biological objects and drying technology.
The liquid pressure decreases as it flows from the condenser to the evaporator. The manufacture of conventional capillary driven heat pipes involves myriad simple operations, particularly when the unit is designed for operation at temperatures of the order of, say 50200c. Dec 16, 2014 this webinar will provide a complete guide to designing, modeling, and implementing heat pipes into your heat sink. Highperformance micro heatpipe by koji yamamoto, kenji nakamizo, hideaki kameoka 2 and kenichi namba 3 with greater electronic equipment speeds and higher performance, more heat is generated posing acute problems of heat dissipation. Crosssection of clamping arrangement used to secure heat pipe to coldplate.
Heat pipes have been designed and built with various crosssectional areas as small as 30. The major advantage is its ability to ensure the convective twophase heat transfer through capillaryporous wick under the pressure drop due to sorbent action inside the heat pipe. Proposed design of micro heat pipes in radiator fin by bassam et al6. The application of heat pipes should be considered when the thermal design is either conduction limited or when nonthermal goals such as weight cannot be achieved with other materials such as solid aluminum andor copper. Minimicro heat pipes mhp and heat pipe spreaders hps, where the device is an integral part of the heat pipe.
Heat pipes are used in a wide range of applications, including electronics cooling, diecasting and injection moulding, heat recovery and energy conservation, deicing and manufacturing process temperature control, and in domestic appliances. Historical perspectives, principles of operations, types of heat pipes are discussed. Heat pipes, i am obliged to point out, are awesome. Long established as the standard work on heat pipes suitable for use as a professional reference and graduate text. I am trying to design a pulsating heat pipe with a capacity of 4050w for cooling of. The high power level currently possible, on the order of 100wcm 2, together with the heat pipes being selfcontained and selfstarting make micro heat pipes an ideal heat transfer system. Sorption micro heat pipe includes the advantages of conventional heat pipes and sorption machines in one unit. Micro heatpipe integrated with led silicon substrate. Microelectromechanical systems mems based microheat pipes, as a novel heat pipe technology, is considered as one of the most promising options for thermal control applications in microelectronic circuits packaging, concentrated solar cells, infrared detectors, microfuel cells, etc. Heat pipe design handbook, volume 1 internet archive. Micro heat pipes are used to eliminate hot spots, reduce temperature gradients, and improve chip reliability. Packed with examples and design information, it takes you through the background and.
Micro heat pipe device utilizing extended nanofluidics rsc. Acts expertise with heat pipe technology can find a thermal solution for your industry. After completion, engineers will be able to design a more effective heat sink. However, the operational temperature of the heat pipe also affects the sonic limit of the heat pipe. Heat pipes, 6th edition, takes a highly practical approach to the design and selection of heat pipes, making it an essential guide for practicing engineers and an. Performance of heat pipe for different working fluids and fill ratios journal of mechanical engineering, vol. Heat pipes ats has compiled a series of engineering ebooks.
He is the author of five books, over 300 archival technical publications. A very small heat pipe that has a diameter between about 100 micrometers and 2 millimeters 0. Several factors have contributed to the science and technology of the present stateofart heat pipe leading to the development of loop heat pipes, micro and miniature heat pipes and micro loop heat pipes. Heat pipes, 6th edition, takes a highly practical approach to the design and selection of heat pipes, making it an essential guide for practicing engineers and an ideal text for postgraduate students. Micro heat pipe article about micro heat pipe by the. The name heat pipe was coined in grovers patent to describe the devices essentially identical to that in the gaugler patent. The operating principles, heat transfer characteristics, and fabrication process of memsbased micro.
As billy mentioned, todays topic is heat pipe design and modeling. This paper presents the design and fabrication of an integrated microheatpipe system consisting of a heater, an array of heat pipes, temperature and capacitive sensors. Micro and miniature heat pipes electronic component coolers. This allows the use of high volume, lower cost heat pipes in a heat sink design. At any cross section of the heat pipe, a pressure differential exists between the vapor and liquid phases. Garimellab aschool of mechanical, aerospace, and systems engineering, kaist, daejeon 305701, republic of korea b school of mechanical engineering and birck nanotechnology center, purdue university, west lafayette, in 479072088, usa. Figure 7 shows a flat pipe design, they can be used as heat spreaders. Describes such heat pipes as revolving, micro, cryogenic, variable conductance as well. Heat pipe product reliability guide water heat pipe parameters and limitations.
This paper presents a breakthrough in the domain of micro heat pipes for electronic cooling. Micro and miniature heat pipes electronic component. The fabrication of this type heat pipe could be achieved by utilizing micro electro mechanical systems memsfabrication technology whichis ilicon s. Heat pipe engineering ebook advanced thermal solutions. Mvk160 heat and mass transfer may 7, 2012, lund, sweden heat pipe, selection of working.
Fundamental study of heat pipe design for high heat flux source ryoji oinuma, frederick r. At least one hollow metal body with a plurality of micro heat pipes embedded in the hollow metal body is used as a heat sink to remove heat from memory chips in a memory device. To maintenance of all pipeworks whether underground or overhead, carrying any fluid like water, oil, air, industrial gases like oxygen, nitrogen, acetylene etc. The theory of microheat pipe was introduced by cotter in 1984.
The paper presents an overview of heat pipes, especially those used in different space missions. Where can i find detailed design guide for pulsating heat pipe. Figure 2 compares the heat transport for heat pipes with different diameters. Grover includes a limited theoretical analysis and presents results of experiments carried out on stainless steel heat pipes incorporating a wire mesh wick and sodium as the working fluid. The online publication and book series dedicated to the thermal. In this chapter, a cpu thermal design power tdp, cooling methods of electronic equipments, heat pipe theory and operation, heat pipes components, such as the wall material, the wick structure, and. In this chapter, a cpu thermal design power tdp, cooling methods of electronic equipments, heat pipe theory and operation, heat pipes components, such as the wall material, the wick structure, and the working fluid, are presented. A heat pipe is a heattransfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces at the hot interface of a heat pipe a liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface. Design considerations when using heat pipes electronics cooling. Amir faghri is currently a professor of mechanical engineering at the university of connecticut, which he joined in 1994 and where he served as the head of the mechanical engineering department 19941998 and as dean of the school of engineering 19982006.
These most common offerings are a great option for testing, sampling, and validating your heat pipe solution into eventual production. An essential guide for practicing engineers and an ideal text for postgraduate students, the book takes a highly practical approach to the design and. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a. Loop heat pipe with coherent porous wick since the porous material used for current heat pipes is usually stochastic structure, it is hard to apply analytical or numerical methods for design optimization.
Heat pipe axial orientation relative to gravity and the axial orientation angular convention78 figure 51. Fabrication, filling, sealing and testing of micro heat pipes except where reference is made to the work of others, the work described in this. This paper presents the design and fabrication of an integrated micro heat pipe system consisting of a heater, an array of heat pipes, temperature and capacitive sensors. The crosssectional area of a heat pipe is the direct function of both the sonic and entrainment limit of the heat pipe. All heat pipes have an evaporator and condenser section where. This webinar will provide a complete guide to designing, modeling, and implementing heat pipes into your heat sink. Micro heat pipes for cooling electronic devices were proposed in 83. Your complete resource on heat pipe operation, behavior, performance characteristics, and limitations this book is designed to help students, operations engineers, and mechanical and electrical engineers in the electronic packaging industry grasp the principles of operation for a wide range of heat pipes. This book introduces operational and design principles for heat pipes. Singh the purpose of this research was to determine the optimal micro heat pipe mhp configuration on high performance heat spreaders. Nov 24, 20 wire sandwiched micro heat pipes part 1. Heat pipes for computer cooling applications intechopen. A heat pipe by itself does not remove or dissipate heat. Optimal micro heat pipe configuration on high performance.
The design of a heat pipe or thermosyphon to fulfill a particular duty involves four broad processes. Other shapes, however, such as rectangular flat heat pipes, conical rotating heat pipes, corrugated flexible heat pipes, and nosecap leading edge heat pipes geometries have been studied. And yet they persist in existing, and working, in spite of my disbelief. Garimellab aschool of mechanical, aerospace, and systems engineering, kaist, daejeon 305701, republic of korea. We present in the introduction the current needs in ter. A mathematical model for analyzing the thermal characteristics of a. As with any design process, many of the decisions that must be taken are interrelated and the process is iterative. Open type minimicro heat pipes are suggested in 4, 5, as a system of thermal control of biological objects and drying technology.
To make it operational, a heat pipe must have as much cooling surface area in form of fins as the equivalentsize aircooled heat sink without a heat pipe. This article is intended to offer design guidance when using heat pipes for the most prevalent types of electronics applications. Ultra flat micro heat pipes generation for space industry. International heat pipe conferences have been conducted, two books on heat pipes have been authored, and numerous papers have been written on the. Ats engineering ebook advanced thermal solutions, inc. Beginning with a definition of the problem, including the temperature. The proposed technology consists of a novel, sophisticated but industrial approach in cooling technique with flat and ultrathin microchannel heat pipes. Some theoretical models capable to predict the effects of the thin film region on the evaporating and. Micro heat pipe article about micro heat pipe by the free. Oct 12, 2006 heat pipes are used in a wide range of applications, including electronics cooling, diecasting and injection moulding, heat recovery and energy conservation, deicing and manufacturing process temperature control, and in domestic appliances. Heat pipes are an extremely effective method of reducing hot spot temperatures and increasing allowable power in a system by moving heat to an external sink or spreading heat along a surface. So the goals of todays webinar is to provide you with the knowledge and tools required to implement a heat pipe solution into your system. Optimal micro heat pipe configuration on high performance heat spreaders by seema s. The capillary condensation efficiency and the liquid transport play two important roles in the cooling performance.
Your complete resource on heat pipe operation, behavior, performance characteristics, and limitations this book is designed to help students. Micro grooves were fabricated on the silicon wafer to serve as micro wick. Use of heat pipe cooling systems in the electronics industry. There are several limits that govern heat pipe theory, however in terrestrial applications the capillary limit is the most limiting factor. Thermalfluidspedia types of heat pipes thermalfluids. Micro heatpipe integrated with led silicon substrate ieee. Nov 01, 2004 mini micro heat pipes mhp and heat pipe spreaders hps, where the device is an integral part of the heat pipe. Heat pipe heat exchangers hphe, which are system level heat pipes, where the heat pipe is used to control temperature in equipment cabinets or systems. Consequently, heat pipes can be a viable and promising solution for this challenge. These ebooks provide engineeringlevel information on various topics and are geared to giving engineers the information they need to design better thermal management solutions for electronic systems. The aim of this chapter is to provide a detailed account the various factors and criterion related to the design of heat pipes. With the increasing illumination intensity of leds, thermal management became a critical issue in its design. Microelectromechanical systems memsbased microheat pipes, as a novel heat pipe technology, is considered as one of the most promising options for thermal control applications in microelectronic circuits packaging, concentrated solar cells, infrared detectors, microfuel cells, etc. Wakefieldvette offers individual heat pipes through distribution.
The ultimate goal was to reduce the spreading resistance and eliminate localized hot spots. When the heat source is much smaller than the heat sink base, a flat. It is expected to provide a basis for memsbased mhp design. Jul 15, 2009 heat pipes, i am obliged to point out, are awesome. Taking advantage of the large difference between the dielectric constants of liquid and vapor, the integrated capacitor can be used for voidfraction measurements in. Micro heat pipe phenomena is often available in nature. When somebody first explained to me how they work, i was like, no way. Ideal when heat needs to be moved more than 3050mm remote fin stacks heat exchangers are a perfect example as with any heat pipe heat sink design, size the heat pipe with an additional 25% thermal headroom if youre interested in spreading heat to reduce hot spot andor attach to a local heat exchanger. For simplicity of design and manufacturing, heat pipe containers are generally circular cylinders. Heat pipe technology is pertinent to the design and application of selfcontrolled. The total heat load a heat pipe can carry is a function of total length, evaporator and condenser length, diameter, and orientation with respect to gravity. Project description by means of knowledge about the theory of heat pipes, one is now able to carry out a basic calculation of a heat pipe. A loop heat pipe with coherent pores integrated to the heat source is considered as a calculation model in this paperfig.
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