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IRJET- Uncertainty Analysis of Flat Plate Oscillating Heat Pipe with Different Working Fluids
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 959 Uncertainty Analysis of Flat Plate Oscillating Heat Pipe with different Working Fluids Gamit Pringal R1, Prof. Amit I. Pandey2, Prof. Maulik A. Modi3, Prof. kamlesh K. Mehta4 1PG student, Mechanical Engineering Department, LDRP-ITR, KSV University, Gandhinagar, India 2,3Assistant Professer, Mechanical Engineering Department, LDRP-ITR, KSV University, Gandhinagar, India 4Head, Mechanical Engineering Department, VPMP Polytechnic, GTU, Gandhinagar, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - With development of higher electronic devices, there is a need forbetterthermalmanagement. Theheatoutputof these devices can potentially exceed the heat transfer capabilities of current heat pipe designs. Oscillating heat pipes (OHPS) have high heat spreading performance and are capable of removinghigherheatfluxes. OHPissuperiorcomparedtotraditional heat pipes and can be used to solve the future cooling problems This study presents the thermal performance of Flat plate oscillating heat pipe (OHP) using different working fluids. The FP-OHP was fabricatedwiththechannelsofsquarecross section which had hydraulic diameters of 2 mm in mini channels. The performance of the FP-OHP will be measured and analyzed by varying input power with fixed filling ratio as 50% and keeping setup in vertical position using different working fluids. And uncertainty analysis is done based on this performance. Key Words: Flat plate oscillating heat pipe, Working Fluids, Thermal performance, Uncertainty analysis. 1. INTRODUCTION: Oscillating heat pipes are also known as pulsating heat pipes (PHP) & are a relatively new developmentinthefield ofheatpipe technology. An OHP is a meandering tube consists of a serpentine channel having capillary dimension which is cooled and heated at various points along its length. Operation of Oscillating heat pipe is mainly based on the phasechangephenomena in a capillary tube and the principle of oscillation for the working fluid. For vapour & liquid plugs to existthediameter ofthetube must be small enough. Initially, the oscillating Heat Pipe is evacuated and then it is partially filled with the working fluid. The liquid slugs interspersed with vapour bubbles are formed due to the Effects from surface tension. Fig-1: Oscillating heat pipe Working principle of closed loop pulsating heat pipe. Akachi and Polasek described the basic principle of an OHP such that: “Whenhightemperatureissuppliesto theone endofthe bundle of turns of the capillary tube the working fluid inside starts evaporating and the vapour pressure increases, due to which the bubbles are developed in the evaporator zone. This pushes the liquid column toward the condenser which has low temperature. Due to condensation taking place at the low temperature end there is increase the pressure difference between the two ends.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 960 Because of the interconnection of the tubes, motion of liquid slugs & vapour bubbles at one section of the tube along the condenser also cause the motion of slugs & bubbles in the next section toward the evaporator (high temperature end), which works as a restoring force. The Interplay between the restoring force&thedrivingforceleadstocauseoscillationofthevapour bubble & liquid slugs in the axial direction. The amplitude and the frequency of the oscillationareexpectedtobedependenton the mass fraction and shear flow of the liquid in the tube”. Heat is transferred through sensible heat transported by the liquid slugs & latent heat of the vapour. 2. EXPERIMENTAL SETUP: Layout of experimental setup is shown in fig. 2 and experimental setup is shown in Fig. 3. It consists of a test section, temperature scanner, vacuum pump, wattmeter, rheostat, cooling water tank. The test section consists of an evaporator section, an adiabatic section and condenser section. Evaporator block is fabricated using copper block have 8mm thickness,30mm width and 70 mm length & has 1 hole for inserting cartridge heater of 6mm diameter and 50mm length.Each cartridge heater has the capacity of the 100W.The copper is selected due to its high thermal conductivity and good machinability properties. The heat loss from evaporator & condenser blocks to back side is prevented by providing asbestos sheet. Condenser block has same dimension as that of evaporator section. Test section also consists Flat plate oscillating heat pipe made up of copper plate having thickness of 10mm. Variac with specification 3F, 300V, 60Hz will be used for power supply. Masibus Temperature scanner is multiple channel temperature indicator having accuracy of 10C.k-typethermocouple sensors are used to sense temperature of the range -200 0C to 1200 0C. Single stage vacuum pump having Ultimate vacuum capacity of 150 microns is used to create vacuum. Fig-2 layout of Experimental setup Fig-3 Experimental Setup
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 961 3. EXPERIMENTAL PROCEDURE: The experimental setup will be prepared by following steps: The copper plate is fabricated to make the square cross section channel of 2x2 mm2 and to drill 6 holes on the side of the plate for temperature measurement access. 2mm dia. hole is drilled at the upper end of the plate to insert the charging section. The temperature sensors are inserted in the plate and heaters are inserted in to the block. Charging section is made up of copper capillary tube. Syringe is used for filling working fluid in heat pipe. Temperature of evaporator section at different point will be recorded as T1, T2 and similarly for condenser as T3, T4. 3.1 Thermal resistance: Thermal resistance of an OHP can be calculated as follows: Where Q is the Heating power and TE & TC are the temperature of the evaporationsectionand condensersectionatsteadystate respectively, which were obtained by averaging the temperature recorded by thermocouples 1-2 and 3-4 respectively. , 3.2 Uncertainty analysis: Yu Zhou, Xiaoyu cui, Jinhua weng, Experimental investigated the Heat transfer performance of an oscillating heat pipe with graphene Nano fluids [11]. The uncertainty analysis is calculated as follows: Uncertainty of the Heating power: Equipment’s used in Heating test have an accuracy of 1%. Uncertainty of the Thermal Resistance: The calibrated accuracy of the thermal resistance is 1 0C. Thus, the absolute uncertainty for the temperature measurement is: The maximum uncertainty of the thermal resistance was calculated as: 3. RESULT AND DISCUSSION: The results obtained experimentally are discussed inthissection.Theinfluenceofdifferentworkingfluidsonthe thermal performance of FP-OHP is analyzed. Vertical bottom EvaporatorpositionisconsideredforFP-OHP.Heatis supplied in the range of 10-100W. Uncertainty analysis is carried out. 3.1 Thermal performance of FP-OHP: Generally, the performance of OHP is measured in terms of Thermal resistance. Lower the thermal resistance indicates better performance of OHP. The OHP is been tested for different working fluids using DI water, Ethanol, Methanol, Acetone. Keeping
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 962 same filling ratio as 50% and considering vertical position. Thermal performance increases with decreases in the thermal resistance, results in higher heat transfer rate from evaporator to condenser section. Thermal resistance is found to be optimum and lowest for acetone as compared to all fluids. When Heat input is maintained constant the thermal resistance is proportional to temperature difference between evaporator and condenser. When condenser temperature is fixed at specific value a lower thermal yields a lower evaporator temperature and an excellent thermal performance. Fig-4 Thermal resistance versus heat input for different fluids. Fig.4 shows effect of input power on thermal resistance of FPOHP for all working fluids thermal resistance decreases with increase in input power because of increased heat transfer between heatsourceandFPOHPfrommoreactivepulsatingmotion in channels. At Lower heat input prediction of thermal resistance is based on pure conduction and depends on properties of working fluids. Thermal resistance is observed highest for DI water and Lowest for acetone where as it falls in between for methanol and ethanol. Increase in heat input advocates influencing parameters which results to increase liquid vapor pulsation in FPOHP. Lowest physical properties of fluid make acetone suitable fluid for efficient thermal performance of FPOHP as compared to other fluids. 3.2 Uncertainty analysis for different working fluids: Yu Zhou, Xiaoyu cui, Jinhua weng, Experimental investigated the Heat transfer performance of an oscillating heat pipe with graphene Nano fluids [11]. The sample calculation for uncertainty analysis for acetone fluid is calculated as follows: Uncertainty of the Heating power: Equipment’s usedinHeatingtesthaveanaccuracyof1%.ConsideringAcetone,fora Heating power of 20W measured voltage is 60V & current is 0.33A. Thus, the uncertainty of the heating power was calculated as: = 5.17% = 0.0517 Uncertainty of the Thermal Resistance: The calibrated accuracy of the thermal resistance is 1 0C. Thus, the absolute uncertainty for the temperature measurement is
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 963 For Acetone as working fluid Heating power at 20W, the minimum temperature difference between the evaporation section and the condensation section was (Te - Tc) min = 9.50C. Thus the maximum uncertainty of the thermal resistance was calculated as 15.7%. Similarly, uncertainty is calculated for all working fluids. Observation table is shown below: Observation Table 1: Uncertainty analysis for different working fluids: Uncertainty of thermal resistance mainly depends upon the difference the difference between evaporator temperature & condenser temperature and calibrated accuracy of instrument used. The (Te – Tc) found to be minimum for acetone fluid as compared to other fluids and also it is found to be lowest at low heat input. Hence uncertainty is maximum at low heat input and for acetone as working fluid as compared to other working fluids. 4. CONCLUSIONS: The aim of this paper is to experimentally investigate the thermal performance of a FP-OHP which are greatly influenced by working fluids. DI water, ethanol, methanol, acetone as working fluids. The conclusions drawn for thermalperformanceofFP- OHP are as follows: The performance of FPOHP improves at a higher heat load. Thermal resistance decreases with increases in heat input irrespective of different working fluids. Acetone gives better performance of FPOHP compared to methanol, ethanol and DI water as working fluids. As heat input increases the uncertainty goes on decreases. Uncertainty is maximum at low heat input and for acetone as working fluid as compared to ethanol, methanol and DI water. Heat Input(Q) Acetone Methanol Ethanol DI water 20 15.7% 12.4% 10.57% 9.7% 30 11.2% 9.5% 8.52% 7.91% 40 8.8% 7.92% 7.04% 6.62% 50 7.09% 6.37% 6.24% 5.79% 60 7.03% 5.51% 5.32% 4.89% 70 5.56% 5.18% 4.86% 4.57% 80 5.53% 5.14% 4.81% 4.53% 90 5.14% 4.89% 4.67% 4.27% 100 4.97% 4.53% 4.33% 4.16%
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 964 REFERENCES [1] Yunus a. Cengel, Heat transfers a practical approach: 2nd edition, Tata McGraw-Hill. [2] A.Fagri,“Heat pipes: Review, opportunities and challenges” 2014. [3] “Development of flat plate oscillating heat pipe as a heat transfer device”. Prof. Kamlesh K Mehta, Dr. Nirvesh S Mehta. [4] “Thermal performance characteristics of a pulsating heat pipe at various non-uniform heating conditions”.DongSooJang, Hyun Joon Chung, Yongseok Jeon, Yonghan Kim. [5] “How to improve the thermal performance of pulsating heat pipes: A review on working fluid”. MohammadAlhuyiNazari, Mohammad H. Ahmadi. [6] “Effect of filling ratio on Heat transfer characteristics and performance of a closed loop pulsatingheatpipe”.Himel Barura, Mohammad Ali, Md. Nuruzzaman. [7] “Effect of inclination angles on Heat transfer characteristics of a closed loop pulsating heat pipe (CLPHP)”. Suchana Akter JAhan, Mohammad Ali, Md. Quamrul Islam. [8] “Investigation of the performance of pulsating heat pipe subject to uniform/alternatingtubediameters”.ChihYungTseng, Kai Shing Yang, Kuo Hsiang Chien. [9] “Effects of the number of turns and the inclination angle on the operating limit of micro pulsatingheat pipe”. Jungseok Lee, Youngh wan Joo. [10] “Development of a pulsating heat pipe with a directional circulation of a working fluid”. V.G.Pastukhov, Yu.F.Maydanik. [11] “Experimental investigation of the heat transfer performance of an oscillating heat pipe with graphene Nano fluids”. Yu Zhou, Xiaoyu Cui, Jianhua Weng, Saiyan shri, Hua Han, Chengmeng Chen.
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