Used to cool transistors and high density semiconductors. Indian institute of technology kanpur, kanpur up 208016 india. Visualization of bubble mechanism of pulsating heat pipe. Startup heat load, maximum heat load and optimum fill ratio of pulsating heat pipe php of 16 turn, 1 mm id, 2 mm od and 9. The oscillating or pulsating heat pipe oph or php is a very promising heat transfer. An oscillating heat pipe, also known as a pulsating heat pipe, is only partially filled with liquid working fluid. Design and operation of a teslatype valve for pulsating heat pipes. Numerical analysis of performance of closedloop pulsating.
Testing was performed showing significant increases in thermal. An experimental investigation on heat transfer performance of. Design and operation of a teslatype valve for pulsating heat pipes citation for published version apa. Comparative study of use of different working fluids in.
Pulsating heat pipe php is a new and emerging cooling technique in the field of thermal management especially in microelectronics. A pulsating heat pipe in action at indian institute of technology kanpur, india. Based on the analysis presented, the system was able to preheat the inlet air by 8 c with an effectiveness of the system near 0. Even the name is heat pipe,but working is very much different than the conventional heat pipes. The pulsating heat pipe cooling module is suitable for heat radiating requirements of highpower heating chips and is applicable to working environments with reverse direction of the gravity, the heat dissipation is uniform, the heat dissipation efficiency of the radiator is high, the assembly is simple and the operation is easy.
Pdf design of a hydrogen pulsating heat pipe researchgate. To learn more about the ohp technology and how we innovate custom thermal solutions, click on a topic below. Visualization experiment is a must in realizing functional characteristics of an operational pulsating heat pipe php. Thermomhydrodynamics of closed loop pulsating heat pipes. 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.
Pdf cfd simulation of a pulsating heat pipe using ansys. Ats engineering ebook advanced thermal solutions, inc. It applies the implied heat of the vaporized working fluid instead of the reasonable heat. Pulsating heat pipes, apparently simple and very promising cooling devices, are very intriguing for theoretical and experimental investigations alike. Comparative study of use of different working fluids in the. Vasiliev luikov heat and mass transfer institute, p. Oscillating heat pipes ohp, also referred to as pulsating heat pipes php, are a relatively. Its the two phase heat transfer device suitable for low power applications such as electronic cooling. For various reasons a closed loop pulsating heat pipe clphp is thermally a. The pulsating heat pipe affords a highly effective heat transfer.
Numerical simulation was performed to establishing a twodimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the mixture and euler models, which were unsteady models of vaporliquid twophase, based on the controlvolume numerical procedure utilizing the semiimplicit method. A pulsating heat pipe system surrounded by metal foam and inserted intoa metal box filled with paraffin wax. Pdf experimental investigations on pulsating heat pipe. Numerical study on flow and heat and mass transfer in. This study was inspired to investigate an alternative cooling system using a heliumbased pulsating heat pipes php, for low temperature superconducting magnets. However modeling of a clphp system in gambit has many challenging issues due to the complexity and multiphysics nature of the system. Pulsating heat pipes, like conventional heat pipes, are closed, twophase systems capable of transporting heat without any additional power input, but they differ from conventional heat. Experimental investigation of pulsating heat pipe performance with regard to fuel cell cooling application. Peregrine successfully demonstrated the feasibility of embedding pulsating heat pipes within the plane of a sheet. Beginning with a definition of the problem, including the temperature. Review of pulsating heat pipe working fluid selection. 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, 70550 stuttgart, germany.
Mar 14, 2019 with the increasing demand for heat dissipation in the electronics industry, pulsating heat pipe php has attracted wide attention due to its simple structure and excellent heat transfer ability. A single clphp is frequently used to release the heat between one heat dissipating device and. Pdf performance of closed loop pulsating heat pipe. For various reasons a closed loop pulsating heat pipe clphp is thermally a better option than an open loop device. Various experiments have been carried out in order to check the influence of filling ratio and input heat flux on the performance of the closed loop pulsating heat pipe clphp. The amount of heat transfer decrease depends on the particular heat pipe. The pulsating heat pipe has a single closed loop made of copper. The closedloop pulsating heat pipe clphp is a heat exchanger with a very high thermal conductivity. Effects of the local pressure losses due to meanderings international journal of heat and mass transfer, vol. Nano heat pipe heat pipes with nano fluid as working fluid can be referred as nano heat pipe the heat transfer capability of the all heat transfer devices including heat pipe is limited by the working fluid transport properties. Gian brochure introduction to heat pipe science and. With appropriate boundary conditions we can visualize the behavior of the model and make predictions regarding its performance.
Pulsating heat pipes are relatively new entrants to the family of heat pipes used for higher heat removal. Experimental investigations on the thermal performance of a. 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. Experimental investigation on the temperature distribution. In this study, the verticallyoriented pulsating heat pipe php heat exchangers charged with either water or hfe7000 in a filling ratio of 35% or 50% were fabricated to exchange the thermal energy between two air streams in a parallelflow arrangement. A helium based pulsating heat pipe for superconducting. They are attractive heat transfer elements, which due to their simple design, cost effectiveness, and excellent thermal performance may find wide applications. Heat pipes and twophase thermosyphons are highly efficient heat transfer elements which utilize liquidvapour phase change latent heat transport. The temperature field is improved and some hot spots are removed in the rack. 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. Investigation on thermal design of a rack with the. The vapor then travels along the heat pipe to the cold interface. Experimental study on effect of inclination angles to ammonia. Aerospace cool satellite solar array, as well as shuttleleading edge during reentry.
Recent advances in electronics design and manufacturing have resulted in significant increases in heat flux density through a miniaturization of components and a. Jun 18, 20 heat pipe applications electronics cooling small high performance componentscause high heat fluxes and high heat dissipation demands. The simulation of a 2d single loop pulsating heat pipe using. Pulsating heat pipe, fill ratio, orientation, working fluids introduction. A new structure of rack with inner duct and pulsating heat pipe was suggested. Heat pipes seminar ppt with pdf report study mafia. In addition, the same approach can be used for exploring other low temperature applications. Flow visualization was conducted for the closed loop pulsating heat pipe using ansys fluent. Design and operation of a teslatype valve for pulsating. A pulsating heat pipe php 1 is a passive and extremely efficient way of exchanging heat between a hot source and a cold one. An introduction to pulsating heat pipes electronics cooling. The closed loop pulsating heat pipe has no complex structure so it is to be modeled. Experimental study on a pulsating heat pipe heat exchanger for energy saving in airconditioning system in summer energy and buildings, vol. The simplified thermal conductivity model of pulsating heat pipe is introduced.
Operational limit of closed loop pulsating heat pipes honghai yang a, s. Oscillating heat pipes ohp, also referred to as pulsating heat pipes php, are a relatively new development in the field of heat pipe technology. High speed flow visualization of a closed loop pulsating heat pipe, proceeding of the 11th international heat pipe conference, tokyo, japan, 1999, pp. Feb 05, 2018 its the two phase heat transfer device suitable for low power applications such as electronic cooling.
The purpose of the project was to study the behaviour of a wickless pulsating heat pipe system in microgravity conditions. Experimental study on effect of inclination angles to ammonia pulsating heat pipe. This presents a computational study on the heat transfer characteristics of closed loop pulsating heat pipe clphps. An experimental investigation of micro pulsating heat pipes. Aug 17, 2011 pulsating heat pipes, apparently simple and very promising cooling devices, are very intriguing for theoretical and experimental investigations alike. So far there is no general formulation which can foretell the complex and chaotic flow nature for every working fluid. Heat pipes and its applications lunds tekniska hogskola. To fulfill the increasing demand of power electronic applications, php is a proven technology which works on principle of selfoscillation of the working fluid and phase change heat transfer phenomenon in a capillary tube. These tubes are evacuated and partially filled with the working fluid. Experimental investigations on the thermal performance of. Comparative study of use of different working fluids in the performance of a pulsating heat pipe written by jagadeesh sk, n. 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. Advances and unsolved issues in pulsating heat pipes.
The working fluids used are water and titanium dioxide nanofluids with varying concentrations of tio 2 nanoparticles 1. Aug 22, 2019 visualization experiment is a must in realizing functional characteristics of an operational pulsating heat pipe php. A new technology of the sorbent bed performance silicagel, zeolite and al2o3 composites with the help of hydrothermal synthesis are used to get some sorption hpp with water as a working fluid. A novel design of pulsating heat pipe with fewer turns applicable to all orientations. Oscillatory flow in pulsating heat pipes with arbitrary. Presently such systems have found niche applications in micropower electronics cooling and the future prospects seem quite promising. The extreme conditions and complexity of the technology.
Jul 22, 2019 the pulsating heat pipe has a single closed loop made of copper. A pulsating heat pipe 10 includes an elongate capillary tube 11, a working fluid 15 disposed within the elongate tube and an artery mesh disposed in the elongate tube. Pulsating heat pipe closed loop php visualization duration. This paper presents preliminary experimental results on thermal performance of closed loop pulsating heat pipe clphp. The experiment purpose is the study of optimum operation modes of pulsing heat pipe with enough large sizes and the opportunity of such pipe using as the absorber of solar collector.
Experimental investigation on thermal performance of a closed. Energies free fulltext experimental investigation on. A closedloop pulsating heat pipe made of a copper tube 1. With the increasing demand for heat dissipation in the electronics industry, pulsating heat pipe php has attracted wide attention due to its simple structure and excellent heat transfer ability. Pulsating heat pipe php is a passive twophase heat transfer device for handling moderate to high heat fluxes typically suited for power electronics and similar applications. Pdf on jan 1, 2019, viacheslav cheverda and others published water pulsating heat pipe find, read and cite all the research you need on. Oscillating heat pipes ohps use thermally driven, twophase fluid flow to rapidly transfer heat between heat sources and heat sinks. Journals pdf frontiers in heat pipes fhp thermal citeseerx. It usually consists of a small diameter tube, closed endtoend in a loop, evacuated and then partially filled with a working fluid. The micro heat pipe offers increased downsizing and improved performance for all electronic devices. Also explore the seminar topics paper on heat pipe with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020. They are attractive heat transfer elements, which due to their simple design, cost effectiveness, and. Up until this point in time all pulsating heat pipes have been produced on a laboratory scale from small diameter bent tubing. Numerical analysis of performance of closed loop pulsating.
Experimental investigations on pulsating heat pipe. May 03, 2017 pulsating heat pipe closed loop php visualization duration. The result is less pumping of the wick with reduced heat transfer. Pulsating heat pipe panels with a thin sorbent bed covering on its fins are convenient for the thermal control systems of refrigerators and heat pumps. Pdf thermal analysis of closed loop pulsating heat pipe. The startup of pulsating heat pipe php leads to the temperature of cpus decrease. Heat exchangers power industries use heat pipe heatexchangers as.
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. Experimental investigation on thermal performance of a. Explore heat pipe with free download of seminar report and ppt in pdf and doc format. Pulsating heat pipe temperature distribution thermal performance inclination angle infrared thermal. Prateek published on 20191012 download full article with reference data and citations. An oscillated heat pipe in research is made of rather long and thin sealed pipe. Effect of design parameters on performance of closed loop. The amount of heat transfer decrease depends on the particular heat. International journal of heat and mass transfer, 105, 111. Sixty microchannel embedded pulsating heat pipes mephps of. Investigation on thermal design of a rack with the pulsating. This page contains heat pipes seminar and ppt with pdf report.
The graph also shows that if the heat pipe is operated against the force of gravity, the liquid undergoes a larger pressure drop. Dec 02, 2019 numerical simulation was performed to establishing a twodimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the mixture and euler models, which were unsteady models of vaporliquid twophase, based on the controlvolume numerical procedure utilizing the semiimplicit method. The capillary tube includes a plurality of heat receiving portions 112 located on a first predetermined part of the elongate tube, and a plurality of heat radiating portions 114 located on a second. Analysis of pulsating heat pipe with capillary wick and varying channel diameter, int. Different response of working fluids and their distinct flow nature as well as their behavior can be visualized which thereby helps to understand the. This is to certify that the thesis entitled, numerical analysis of performance of closed loop pulsating heat pipe submitted by mr. A heat pipe is a device that effortlessly transports thermal energy from its one point to the other.
In this paper, a novel study on performance of closed loop pulsating heat pipe clphp. Nov 06, 2010 a pulsating heat pipe in action at indian institute of technology kanpur, india. This paper presents an experimental study on the operational limitation of closed loop pulsating heat pipes clphps, which consist of a total of 40 copper tubes with 1 mm and 2 mm inner diameter, respectively. Visualization of bubble mechanism of pulsating heat pipe with. Heat pipe applications electronics cooling small high performance componentscause high heat fluxes and high heat dissipation demands. This paper presents preliminary experimental results on thermal performance of closed loop pulsating heat pipe php using copper tube having internal and. Pdf cfd simulation of a pulsating heat pipe using ansys fluent. They have found widespread application, ranging from microelectronics cooling in computers and satellites to largescale waste heat recovery in various industries and power stations. The pipe is arranged in a serpentine pattern in which freely moving liquid and vapor segments alternate. Nov 11, 2015 the micro heat pipe offers increased downsizing and improved performance for all electronic devices. The pulsating heat pipe cooling module is suitable for heatradiating requirements of highpower heating chips and is applicable to. Ohp applications and industries ohp technical resources.