This paper presents preliminary experimental results on thermal performance of closed loop pulsating heat pipe php using copper tube having internal and. Aug 17, 2011 pulsating heat pipes, apparently simple and very promising cooling devices, are very intriguing for theoretical and experimental investigations alike. Ats engineering ebook advanced thermal solutions, inc. Pdf on jan 1, 2019, viacheslav cheverda and others published water pulsating heat pipe find, read and cite all the research you need on. A pulsating heat pipe system surrounded by metal foam and inserted intoa metal box filled with paraffin wax.
Prateek published on 20191012 download full article with reference data and citations. 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. Indian institute of technology kanpur, kanpur up 208016 india. 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. Experimental investigations on the thermal performance of a. Beginning with a definition of the problem, including the temperature. It applies the implied heat of the vaporized working fluid instead of the reasonable heat. Numerical model of a multiturn closed loop pulsating heat pipe. Experimental investigation on the temperature distribution. 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. The amount of heat transfer decrease depends on the particular heat.
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 study was inspired to investigate an alternative cooling system using a heliumbased pulsating heat pipes php, for low temperature superconducting magnets. A pulsating heat pipe in action at indian institute of technology kanpur, india. Comparative study of use of different working fluids in the performance of a pulsating heat pipe written by jagadeesh sk, n. Oscillating heat pipes ohp, also referred to as pulsating heat pipes php, are a relatively new development in the field of heat pipe technology. 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. Nov 11, 2015 the micro heat pipe offers increased downsizing and improved performance for all electronic devices.
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 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. An experimental investigation on heat transfer performance of. 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. Aug 22, 2019 visualization experiment is a must in realizing functional characteristics of an operational pulsating heat pipe php. International journal of heat and mass transfer, 105, 111.
The advancement in technology incorporated a huge number of components to a single chip where the performance improved but the heat rejection rate increased owing for a highly efficient cooling method. The oscillating or pulsating heat pipe oph or php is a very promising heat transfer. To learn more about the ohp technology and how we innovate custom thermal solutions, click on a topic below. The startup of pulsating heat pipe php leads to the temperature of cpus decrease. 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. The pulsating heat pipe affords a highly effective heat transfer. 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. High speed flow visualization of a closed loop pulsating heat pipe, proceeding of the 11th international heat pipe conference, tokyo, japan, 1999, pp. For various reasons a closed loop pulsating heat pipe clphp is thermally a. A new structure of rack with inner duct and pulsating heat pipe was suggested. Us20080073066a1 pulsating heat pipe with flexible artery.
Pulsating heat pipe closed loop php visualization duration. Comparative study of use of different working fluids in the. Experimental study on effect of inclination angles to ammonia pulsating heat pipe. Flow visualization was conducted for the closed loop pulsating heat pipe using ansys fluent. The vapor then travels along the heat pipe to the cold interface. Oscillating heat pipes ohps use thermally driven, twophase fluid flow to rapidly transfer heat between heat sources and heat sinks.
This presents a computational study on the heat transfer characteristics of closed loop pulsating heat pipe clphps. Oscillatory flow in pulsating heat pipes with arbitrary. Jun 18, 20 heat pipe applications electronics cooling small high performance componentscause high heat fluxes and high heat dissipation demands. 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. 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 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 and operation of a teslatype valve for pulsating heat pipes.
Pdf performance of closed loop pulsating heat pipe. 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. A single clphp is frequently used to release the heat between one heat dissipating device and. The simplified thermal conductivity model of pulsating heat pipe is introduced. Analysis of pulsating heat pipe with capillary wick and varying channel diameter, int. A pulsating heat pipe php 1 is a passive and extremely efficient way of exchanging heat between a hot source and a cold one. The pipe is arranged in a serpentine pattern in which freely moving liquid and vapor segments alternate. Design and operation of a teslatype valve for pulsating heat pipes citation for published version apa. Peregrine successfully demonstrated the feasibility of embedding pulsating heat pipes within the plane of a sheet. May 03, 2017 pulsating heat pipe closed loop php visualization duration. 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. An oscillating heat pipe, also known as a pulsating heat pipe, is only partially filled with liquid working fluid. Heat exchangers power industries use heat pipe heatexchangers as. However modeling of a clphp system in gambit has many challenging issues due to the complexity and multiphysics nature of the system.
Visualization experiment is a must in realizing functional characteristics of an operational pulsating heat pipe php. 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. With appropriate boundary conditions we can visualize the behavior of the model and make predictions regarding its performance. The graph also shows that if the heat pipe is operated against the force of gravity, the liquid undergoes a larger pressure drop. Visualization of bubble mechanism of pulsating heat pipe with. It usually consists of a small diameter tube, closed endtoend in a loop, evacuated and then partially filled with a working fluid.
Even the name is heat pipe,but working is very much different than the conventional heat pipes. Sixty microchannel embedded pulsating heat pipes mephps of. 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. Pdf cfd simulation of a pulsating heat pipe using ansys. Recent advances in electronics design and manufacturing have resulted in significant increases in heat flux density through a miniaturization of components and a. These tubes are evacuated and partially filled with the working fluid. The result is less pumping of the wick with reduced heat transfer. 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. Numerical study on flow and heat and mass transfer in.
Comparative study of use of different working fluids in. Experimental study on a pulsating heat pipe heat exchanger for energy saving in airconditioning system in summer energy and buildings, vol. The extreme conditions and complexity of the technology. Used to cool transistors and high density semiconductors. Up until this point in time all pulsating heat pipes have been produced on a laboratory scale from small diameter bent tubing. This paper presents preliminary experimental results on thermal performance of closed loop pulsating heat pipe clphp. Experimental study on effect of inclination angles to ammonia.
Thermomhydrodynamics of closed loop pulsating heat pipes. Explore heat pipe with free download of seminar report and ppt in pdf and doc format. Visualization of bubble mechanism of pulsating heat pipe. 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 pulsating heat pipe has a single closed loop made of copper. Experimental investigations on the thermal performance of. Jul 22, 2019 the pulsating heat pipe has a single closed loop made of copper. However, due to the unique operational mechanism of php, the temperature distribution in the evaporation section is obviously not even during the operational process of php. Pulsating heat pipe, fill ratio, orientation, working fluids introduction. 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. Gian brochure introduction to heat pipe science and.
For various reasons a closed loop pulsating heat pipe clphp is thermally a better option than an open loop device. Pulsating heat pipes are relatively new entrants to the family of heat pipes used for higher heat removal. The simulation of a 2d single loop pulsating heat pipe using. The working fluids used are water and titanium dioxide nanofluids with varying concentrations of tio 2 nanoparticles 1. Ohp applications and industries ohp technical resources. Effect of design parameters on performance of closed loop. Operational limit of closed loop pulsating heat pipes honghai yang a, s. The closed loop pulsating heat pipe has no complex structure so it is to be modeled. Pulsating heat pipes, apparently simple and very promising cooling devices, are very intriguing for theoretical and experimental investigations alike. Pdf cfd simulation of a pulsating heat pipe using ansys fluent.
The micro heat pipe offers increased downsizing and improved performance for all electronic devices. Pdf design of a hydrogen pulsating heat pipe researchgate. Pdf thermal analysis of closed loop pulsating heat pipe. In addition, the same approach can be used for exploring other low temperature applications. Pdf experimental investigations on pulsating heat pipe. A novel design of pulsating heat pipe with fewer turns applicable to all orientations.
A closedloop pulsating heat pipe made of a copper tube 1. 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. 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. Operational limit of closed loop pulsating heat pipes. Heat pipe applications electronics cooling small high performance componentscause high heat fluxes and high heat dissipation demands. An experimental investigation of micro pulsating heat pipes. The purpose of the project was to study the behaviour of a wickless pulsating heat pipe system in microgravity conditions. 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. Effects of the local pressure losses due to meanderings international journal of heat and mass transfer, vol. Investigation on thermal design of a rack with the pulsating. Presently such systems have found niche applications in micropower electronics cooling and the future prospects seem quite promising. In this paper, a novel study on performance of closed loop pulsating heat pipe clphp.
Advances and unsolved issues in pulsating heat pipes. Oscillating heat pipes ohp, also referred to as pulsating heat pipes php, are a relatively. Nov 06, 2010 a pulsating heat pipe in action at indian institute of technology kanpur, india. Effect of pure and binary fluids on closed loop pulsating heat pipe. Pulsating heat pipe temperature distribution thermal performance inclination angle infrared thermal.
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. They are attractive heat transfer elements, which due to their simple design, cost effectiveness, and excellent thermal performance may find wide applications. An oscillated heat pipe in research is made of rather long and thin sealed pipe. Numerical analysis of performance of closed loop pulsating. This is to certify that the thesis entitled, numerical analysis of performance of closed loop pulsating heat pipe submitted by mr. They are attractive heat transfer elements, which due to their simple design, cost effectiveness, and. Heat pipes and its applications lunds tekniska hogskola. The closedloop pulsating heat pipe clphp is a heat exchanger with a very high thermal conductivity. Feb 05, 2018 its the two phase heat transfer device suitable for low power applications such as electronic cooling.
Pulsating heat pipe php is a new and emerging cooling technique in the field of thermal management especially in microelectronics. 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. Investigation on thermal design of a rack with the. 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. Heat pipes and twophase thermosyphons are highly efficient heat transfer elements which utilize liquidvapour phase change latent heat transport. This page contains heat pipes seminar and ppt with pdf report. 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. Its the two phase heat transfer device suitable for low power applications such as electronic cooling.
The temperature field is improved and some hot spots are removed in the rack. 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. Numerical analysis of performance of closedloop pulsating. Experimental investigations on pulsating heat pipe. Experimental investigation of pulsating heat pipe performance with regard to fuel cell cooling application.
Design and operation of a teslatype valve for pulsating. Journals pdf frontiers in heat pipes fhp thermal citeseerx. Experimental investigation on thermal performance of a closed. Aerospace cool satellite solar array, as well as shuttleleading edge during reentry. Review of pulsating heat pipe working fluid selection. The utility model provides a pulsating heat pipe cooling module, comprising one or one than one closed pulsating heat pipe which is bent into a ushaped groove, and a radiator for adsorbing heat from the pulsating heat pipe is arranged in a ushaped groove body. An introduction to pulsating heat pipes electronics cooling. The amount of heat transfer decrease depends on the particular heat pipe. A heat pipe is a device that effortlessly transports thermal energy from its one point to the other. The pulsating heat pipe cooling module is suitable for heatradiating requirements of highpower heating chips and is applicable to. Energies free fulltext experimental investigation on.
987 165 882 732 294 418 1208 885 286 585 334 1255 8 553 312 167 736 999 825 1425 173 1512 423 1112 1153 1396 75 1031 1473