Parametric studies on pulsating heat pipe

Narasimha, K. Rama; Sridhara, S. N.; Rajagopal, M.S.; Seetharamu, K.N.

doi:10.1108/96155391080001274

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…There is no additional capillary weak structure inside the tube. [3], Zhang [4] and Rama Narasimha et al [12]. Characterization of thermal performance in multi-loop PHPs has been investigated by Cai [5], Charoensawan [6], Khandekar [7,8] and Meena et al [9].…”

Section: Introductionmentioning

confidence: 96%

An Experimental Investigation on the Effect of Fin in the Performance of Closed Loop Pulsating Heat Pipe (CLPHP)

Rahman¹,

Sultan²,

Islam³

et al. 2015

Procedia Engineering

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Pulsating heat pipes (PHP) have created a newer arena and promising possibilities as passive devices for heat transfer applications, especially suited for thermal management of electronics. A closed loop pulsating heat pipe (CLPHP) made of copper with 2 mm ID and 2.5 mm OD with fin in the condenser section is used in the present work to evaluate the heat transfer performances where the evaporation section is 50 mm, adiabatic section is 120 mm and condensation section is 80 mm. The attempt is to analyze and compare the effects on the heat transfer performances of CLPHP with finned and un-finned condenser section with inclination angle of 0 (vertical), 30 and 45 . Methanol is used as working fluid with 50% filling ratio in CLPHP with 8 loops during the experimentation. The experimental results indicate a strong influence of gravity and thermo physical properties of the working fluid on the performance of the CLPHP studied with different orientation and heat load. The results demonstrate the effect of fin used in condenser section, the input heat flux, inclination angle orientation and physiochemical properties of the working fluid on the thermal performance of the device. The finned CLPHP at 45 inclination exhibits the considerable enhancement of heat transfer compared with that of CLPHP without fin.

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Section: Introductionmentioning

confidence: 96%

An Experimental Investigation on the Effect of Fin in the Performance of Closed Loop Pulsating Heat Pipe (CLPHP)

Rahman¹,

Sultan²,

Islam³

et al. 2015

Procedia Engineering

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show abstract

“…For instance, the effects of hydraulic diameter, the number of turns, working fluids, filling liquid ratio, inclined angles, and heat transfer rate on the performance of PHP were reported by Refs. [2,[4][5][6][7][8][9][10][11][12], Refs. [4,7,13], Refs.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of oscillatory phenomena in a horizontal closed-loop pulsating heat pipe with asymmetrical arrayed minichannel

Chiang

Chien

Chen

et al. 2012

International Communications in Heat and Mass Transfer

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“…Therefore, the generated heat and temperature per unit volume have risen, resulting in a significant reduction in the HFF 33,3 devices' operating efficiency and service life. Therefore, several efficient cooling technologies have been proposed to reduce the temperature of microelectronic devices with high heat flux, such as heat pipe cooling (Narasimha et al, 2010), microchannel cooling (Chein and Chen, 2009), phase-change cooling (Zhao et al, 2020) and jet impingement cooling (Abo-Zahhad et al, 2018). Jet impingement cooling has very high heat and mass transfer rates (Martin, 1977) and has attracted the attention of many scholars.…”

Section: Introductionmentioning

confidence: 99%

Structure optimization and cooling performance of a heat sink with discontinuous arc protrusions impacted by nanofluid confined slot jet impingement

Tang

Deng

et al. 2022

HFF

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Purpose The purpose of this paper is to improve the overall heat transfer performance and the temperature uniformity of the heat sink and to explore the effects of the jet Reynolds number and the nanoparticle volume fraction of the nanofluids on the flow and heat transfer performance. Design/methodology/approach A heat sink with discontinuous arc protrusions in the wall jet region is proposed for confined slot jet impingement. A sloping upper cover plate is added to improve the heat transfer effect in this area. An Al2O3–water nanofluid is selected as the working fluid of the jet for better heat transfer. The Standard k-e turbulence model is used for numerical calculation. The key structural parameters of the heat sink are optimized by the response surface method and a genetic algorithm. The effects of the jet Reynolds number (Re) and the nanofluid concentration (ϕ) on the flow and heat transfer performance of the optimized heat sink are investigated. Findings The average Nusselt number of the optimal heat sink is 8.2% higher and the friction resistance is 5.9% lower than that of the initial flat plate heat sink when ϕ = 0.02 and Re = 8,000. The discontinuous arc protrusions and the sloping upper cover plate substantially enhance the heat transfer in the later stage of jet development, improving the temperature uniformity of the heat sink. The maximum temperature difference of the optimal heat sink is 28.1% lower than that of the flat plate heat sink at the same nozzle height. As the jet Reynolds number and the nanofluid particle concentration increase, the Nusselt number of the optimized heat sink and the friction coefficients increase, resulting in a decrease in the evaluation coefficient. However, the overall temperature uniformity of the heat sink is improved under all conditions. Originality/value The novel heat sink structure provides a new way to enhance the heat transfer and temperature uniformity of confined slot jet impingement. The flow and heat transfer performance of the heat sink impinged by confined slot jet of nanofluids are obtained. The combination of response surface method and genetic algorithm can be applied to the multi-objective optimization of heat resistance and flow resistance of heat sink.

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Parametric studies on pulsating heat pipe

Cited by 3 publications

References 12 publications

An Experimental Investigation on the Effect of Fin in the Performance of Closed Loop Pulsating Heat Pipe (CLPHP)

An Experimental Investigation on the Effect of Fin in the Performance of Closed Loop Pulsating Heat Pipe (CLPHP)

Theoretical study of oscillatory phenomena in a horizontal closed-loop pulsating heat pipe with asymmetrical arrayed minichannel

Structure optimization and cooling performance of a heat sink with discontinuous arc protrusions impacted by nanofluid confined slot jet impingement

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