Abstract pulsating heat pipes phps are the new addition to. How to make a heat pipe or solar heat collector duration. In the present research work, experimental studies were performed on pulsating heat pipe made from copper tube having internal and external diameter of 2 mm and 3 mm respectively. A hybrid loop thermosyphonpulsating heat pipe named space pulsating heat pipe sphp is tested both on ground and in hypermicrogravity conditions. Two configurations of pulsating heat pipe i open loop ii closed loop cooling philosophy of pulsating heat pipes to achieve the objective of this paper, it is worthwhile to begin with an overall perspective on the principal ideas behind various heat transfer technologies. Introduction akachi proposed and patented pulsating or loop type heat pipein 1990s 1.
Its the two phase heat transfer device suitable for low power applications such as electronic cooling. Groll c a college of environmental science and engineering, donghua university, shanghai 200051, pr china b mechanical engineering department, indian institute of technology kanpur, kanpur 208016, india c institute of nuclear technology and energy systems, university of stuttgart. Characteristics of an openloop pulsating heat pipe and flow visualization using a transparent tube koji fumoto a, masahiro kawaji b and tsuyoshi kawanami c a hirosaki university, 3 bunkyocho, hirosaki, 0368561, japan b city college of new york, new york, ny 10032, usa c kobe university, 11 rokkodaicho, nadaku, kobe, 6578501, japan. Stl files into flow3d and superimposed upon the domain of.
In this context, pulsating heat pipe php cooling is the new. Files are available under licenses specified on their description page. Oscillating heat pipes ohp, also referred to as pulsating heat pipes php, are a relatively new development in the field of heat pipe technology. Schematic of a typical pulsating heat pipe with design variations. The pulsating heat pipe affords a highly effective heat transfer component that has been extensively researched at room temperature, but is. An introduction to pulsating heat pipes may 1, 2003 sameer khandekar heat pipes design, liquid cooling, number 2, php, pulsating heat pipe, volume 9 modern electronics thermal management faces considerable challenges in the wake of component miniaturization, which has led to higher demands on net heat flux dissipation. Thermomhydrodynamics of closed loop pulsating heat pipes iitk. Journals pdf frontiers in heat pipes fhp effect of. An experimental investigation on pulsating heat pipes with duallayer and single layer configurations was conducted in order to determine the effect of the heat transfer and overall system performance given a constrained dimensional heat source with a duallayer arrangement. The heat transfer solutions are applied to the thermal model of the pulsating heat. Heat pipe science and technology, an international journal is encompassed on publishing i fundamental studies of heat and mass transfer in heat pipes and twophase thermosyphons, ii new streams of technology development, iii industrial innovation in electronic thermal control, air conditioning, heating and cooling, aerospace thermal control. This report presents a numerical model of a pulsating heat pipe, a device employing a two phase. Media in category pop pop boat the following 21 files are in this category, out of 21 total. Computational model of miniature pulsating heat pipes sandia.
The pulsating heat pipe php shows potential to meet this need, due to its high heat flux capacity, simplicity, and low cost. It is a member of wickless heat pipes the oscillation of working fluid and phase change phenomina in capillary tube is basic principle. Ats engineering ebook advanced thermal solutions, inc. A closed loop pulsating heat pipe php consists of a capillarysized tube or channel arranged in. The basic structure of a typical pulsating heat pipe consists of meandering capillary tubes having no internal wick structure, as shown in figure 1a. Heat transfer in the evaporator and condenser sections of a pulsating heat pipe php with open end is modeled by analyzing thin film evaporation and condensation. Closed loop pulsating heat pipe php is a twophase passive heat transfer device proposed and patented by akachi 1990. Twophase passive devices are proven solutions for modern microelectronics thermal management. Pulsating heat pipe php is a heat exchanger device which absorbs heat from. Thermal performance of closed loop pulsating heat pipe. Pulsating heat pipe pulsating or oscillating heat pipe, invented in early 1990s present promising alternatives for the removal of high localized heat fluxes to provide a necessary level of temperature uniformity across the components that need to be cooled. The experimental results demonstrate the heat transfer characteristics, lower thermal resistance and higher heat transfer coefficient of php are found to be better at a fill ratio of 60% for various heat input.
Experimental research was conducted to understand heat transfer characteristic of pulsating heat pipe in this paper, and the php is made of high quality glass capillary tube. Thermal performance of a pulsating heat pipe with various. Experimental research on heat transfer of pulsating heat pipe. Heat pipes have, however, been manufactured which rely on the capillary action of a wick to provide bidirectional operation. Therefore, a new heat pipe called the pulsating or oscillating heat pipe php was introduced by akachi in 1990 4. Php uses the technique of transporting the working fluid by means of. Microsoft word gian brochure introduction to heat pipe science and technology. 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. Our proprietary diffusion bonding technology is then applied to assemble the mephps. Pdf on jan 1, 2019, viacheslav cheverda and others published water pulsating heat pipe find, read and cite all the research you need on.
Peregrine embeds pulsating heat pipes within the plane of flat sheetsplates by using printed circuit board technology to micromachine the channels. Member of the committee on international heat pipe conferences 1973, acted as committee chairman from 1990 till 2004, and since. The closed loop pulsating heat pipe of inner diameter 2mm is filled with one of the fluid with a filling ratio of 50% and the variation of temperature is observed for every 2 minutes interval of time at 100 watts, 120 watts 1nd 140 watts. Pdf heat transfer in a pulsating heat pipe with open end. Individual images could be stored on a pcmcia card in a bit map format and could be. Under different fill ratio, heat transfer rate and many other influence factors, the flow patterns were observed in the startup, transition and stable stage. The simulation of a 2d single loop pulsating heat pipe using. High performance ultra thin heat pipe cooling module for. Even the name is heat pipe,but working is very much different than the conventional heat pipes. This study investigates the thermal resistance characteristics of the php charged with acetonebased binary mixtures, where deionized water, methanol and ethanol were added to and mixed with. The combined effect of sudden pipe expansion and pulsation frequency on the heat transfer was carried out for both locations of pulsating system upstream and downstream when the upstream. A heat pipe system is integrated in the electronics board between case and wedgelock and a twophase pumped system is integrated to replace a liquid cooling system. A new teslatype valve is successfully designed for promoting circulation in a pulsating heat pipe php.
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. 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. Pulsating heat pipes phps are used as high efficiency heat exchangers, and the selection of working fluids in phps has a great impact on the heat transfer performance. Introduction figure 1 shows a schematic of a pulsating heat pipe php were the change in volume of the vapor bubbles. The simplicity of the gravity return heat pipe makes this the preferred solution for a wide range of heat pipe applications. Beginning with a definition of the problem, including the temperature. Culham microelectronics heat transfer laboratory department of mechanical engineering university of waterloo waterloo, ontario, canada, n2l 3g1 phone. In addition to its excellent heat transfer performance, it has a simple structure. Design and operation of a teslatype valve for pulsating heat pipes citation for published version apa. A heat pipe is a structure with very high thermal conductivity that enables the transportation of heat whilst maintaining almost uniform temperature along. This makes it a very inexpensive and easytointegrate heat spreader which can be bene.
Table 1 documents parameter combinations that correspond to a few cases. Modeling of pulsating heat pipes sandia national laboratories. A unique experimental apparatus able to reproduce a pulsating flow representative of the engine exhaust has been designed. Hybrid pulsating heat pipe for space applications with non uniform. We explore and scrutinize two possible configurations of pulsating heat pipe php based heat exchangers for process waste heat exchange as well as high heat flux. 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. Pdf design of a hydrogen pulsating heat pipe researchgate.
They are attractive heat transfer elements, which due to their simple design, cost effectiveness, and excellent thermal performance may find wide applications. A pulsating heat pipe php is typically a multiturn capillary tube containing a working fluid with a. To make liquid and vapour plugs to exist diameter of tube must be small. A pulsating heat pipe php 1 is a passive and extremely efficient way of exchanging heat between a hot source and a cold one. Pdf the oscillating or pulsating heat pipe oph or php is a very promising heat transfer device. The dual layer configuration is an assembly of two pulsating heat pipes of equal measurement. Pulsating heat pipe, fill ratio, orientation, working fluids introduction.
Benefits and drawbacks of using twophase cooling technologies in military platforms. Innovative cooling by pulsating heat pipe for hts superconducting coil objective and scientific interest the objective of the project is the realization and testing of an oscillating heat pipecooled hts superconducting coil with metalasinsulation winding. Heat pipes have been widely applied in the electronic cooling field because they are capable of passively transferring a large amount of heat with a small temperature difference. Pdf cfd simulation of a pulsating heat pipe using ansys. The pulsating called also oscillating heat pipe php is a simple capillary tube bent in meander and filled with a twophase fluid. Originally developed and patented by hisateru akachi in 1990, ohps consist of a long meandering tube which is heated and cooled at various points along its length. Indian institute of technology kanpur, kanpur up 208016 india. Pulsating heat pipe is an effective method of heat transfer through passive two phase mechanism.
Publishers pdf, also known as version of record includes final page, issue and volume numbers. They differ by their geometry and a mechanism of fluid transport inside the heat pipe. Characteristics of an openloop pulsating heat pipe and. Heat transfer performance of a pulsating heat pipe charged.
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. Design and operation of a teslatype valve for pulsating. Pulsating heat pipes, apparently simple and very promising cooling devices, are very intriguing for theoretical and experimental investigations alike. Performance analysis of pulsating heat pipes using various. Gian brochure introduction to heat pipe science and. An experimental investigation of micro pulsating heat pipes. An introduction to pulsating heat pipes electronics cooling. A multiturn compact closed loop php is made of aluminum and partially filled with fc72 50% vol. In this experiment the performance of pulsating heat pipe using ethanol and distilled water is experimented. In these conditions, heat transfer mechanism is affected by the pulsating flow parameters. A php is a simple in structure with a small diameter coil partially filled with certain working fluid in it and extended from the heat source to sink. A flat plate php was integrated into an aluminum flat plate heat sink with a simulated electronic load.
Large diameter pulsating heat pipe for future experiments. A rule of thumb for the effective thermal conductivity of a heat pipe is 4000 wmk. Effect of filling ratio on thermal performance of closed. If you have a disability and are having trouble accessing information on this website or need materials in an alternate format, contact web. Heat pipes are recognised as one of the most efficient passive heat transfer technologies available. In recent years, heat pipes have been widely used in various hand held mobile electronic. The oscillating or pulsating heat pipe oph or php is a very promising heat transfer device. Paper open access design and operation of a cryogenic. A pulsating heat pipe in action at indian institute of technology kanpur, india. Heat transfer in a pulsating heat pipe with open end. High performance ultra thin heat pipe cooling module for mobile hand held electronic devices. The objective of the present work is to experimentally investigate heat transfers for pulsatile turbulent flows in a pipe. The effects of the battery cell stack arrangement, heating ratio, and inclination angle were analyzed at various heat inputs.