Experimental investigation on performance of a rotating closed loop pulsating heat pipe

Aboutalebi, Mohammad; Moghaddam, A Mortazavi; Mohammadi, Niloofar; Shafii, Mohammad Behshad

doi:10.1016/j.icheatmasstransfer.2013.04.008

Cited by 72 publications

(17 citation statements)

References 18 publications

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“…The selection of a suitable FR is a major parameter in every type of heat pipe [28]. In this study, FR was defined as the ratio of the volume of charged liquid to that of the whole THP.…”

Section: Selection Of Proper Filling Ratio (Fr)mentioning

confidence: 99%

Experimental investigation of the increasing thermal efficiency of an indirect water bath heater by use of thermosyphon heat pipe

et al. 2020

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Natural gas must be preheated prior to pressure reduction in city gate stations (CGSs). Indirect water bath heaters are employed in CGSs for preheating, consume a considerable amount of natural gas for the process. This type of heater has a low efficiency therefore a significant amount of energy is wasted. Due to the high capacity of thermosyphon heat pipe (THP), its utilization in CGS heater were investigated experimentally in this paper. For this purpose, a heater setup was manufactured and its thermal efficiency was calculated. THPs were then designed, manufactured, and utilized between the fire tube and the gas tube. Further the type of working fluid and the range of filling ratio (FR) were discussed and the most effective state was suggested. Moreover, the thermal efficiency of the heater in the presence of THPs was investigated. The obtained results showed that the thermal efficiency of the heater improved up to 13% with the addition of THPs. The most effective state of THPs was associated with the water as working fluid with 20% FR in the front route and methanol as working fluid with 30% FR in the back route of the fire tube.

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“…The selection of a suitable FR is a major parameter in every type of heat pipe [28]. In this study, FR was defined as the ratio of the volume of charged liquid to that of the whole THP.…”

Section: Selection Of Proper Filling Ratio (Fr)mentioning

confidence: 99%

Experimental investigation of the increasing thermal efficiency of an indirect water bath heater by use of thermosyphon heat pipe

et al. 2020

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“…There is great effect of gravity and number of turns on the performance of closed loop pulsating heat pipe by experimentation of closed loop heat pipe of different number of turns. CLPHP was made up of copper tubes of 1.0 and 2.0 m internal diameter, [2]. The fluids employed are ethanol, water and R-123.…”

Section: Refrigerant Selection Criteriamentioning

confidence: 99%

A Review of Experimental Study and CFD Based Simulation of Closed Loop Pulsating Heat Pipe

Tiwari¹,

Diwakar

2016

Int. J. Res. Granthaalayah

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“…It was found from a past study [9] on water-filled RCLPHP with an internal diameter of 2.03 mm and four meandering turns that when the rotational speed increased from 50 rpm to 175 rpm, 300 rpm, 425 rpm, 550 rpm, 625 rpm, and 800 rpm, the thermal resistance decreased continuously. This is because the condensate flows back to receive the heat input in the evaporator section with higher velocity.…”

Section: Introductionmentioning

confidence: 99%

“…However, an ordinary CLPHP cannot be directly applied on rotating machines which operate with very high rotational speed, such as disk brakes, superconductor bearings, and steam turbine blades. In order to solve this problem, Aboutalebi et al [9] firstly developed the shape of the CLPHP for it to suitably fit into the rotating machineries. The CLPHP was bent into the shape of a flower petal and arranged around the circumference of the radial part, which had accumulative heat, of a rotating machine.…”

Section: Introductionmentioning

confidence: 99%

Thermal resistance of rotating closed-loop pulsating heat pipes: Effects of working fluids and internal diameters

et al. 2017

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Original scientific paper https://doi.org/10.2298/TSCI160827009KThe objective of this study was to experimentally investigate the effects of working fluids and internal diameters on the thermal resistance of rotating closed-loop pulsating heat pipes (RCLPHP). The RCLPHP were made of a copper tube with internal diameters of 1.50 mm and 1.78 mm, bent into the shape of a flower petal, and arranged into a circle with 11 turns. The evaporator section was located at the outer end of the tube bundle. R123, ethanol, and water were filled as the working fluids. The RCLPHP was rotated at centrifugal accelerations 0.5, 1, 3, 5, 10, and 20 times of the gravitational acceleration considered at the connection between the evaporator and the condenser sections. The heat input was varied from 30 W to 50 W, and then to 100 W, 150 W, and 200 W. It can be concluded that when the latent heat of evaporation increases, the pressure difference between the evaporator and the condenser sections decreases, and the thermal resistance increases. Moreover, when the internal diameter increases, the driving force increases and the frictional force proportionally decreases, or the Karman number increases, and the thermal resistance decreases.

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Experimental investigation on performance of a rotating closed loop pulsating heat pipe

Cited by 72 publications

References 18 publications

Experimental investigation of the increasing thermal efficiency of an indirect water bath heater by use of thermosyphon heat pipe

Experimental investigation of the increasing thermal efficiency of an indirect water bath heater by use of thermosyphon heat pipe

A Review of Experimental Study and CFD Based Simulation of Closed Loop Pulsating Heat Pipe

Thermal resistance of rotating closed-loop pulsating heat pipes: Effects of working fluids and internal diameters

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