Numerical investigation of effect of fill ratio and inclination angle on a thermosiphon heat pipe thermal performance

Alammar, Ahmed A.; Al-Dadah, Raya; Mahmoud, Saad

doi:10.1016/j.applthermaleng.2016.07.163

Cited by 110 publications

(16 citation statements)

References 26 publications

(36 reference statements)

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“…The filling ratio is a very main issue to impact the thermal performance of straight heat pipe. Figure (5) shows the variation of measurement average wall of evaporator temperature of input power ranging from 10 W to 100 W at a stage of 10 W when the fill ratios 15%, 25%, 50% and 85%. It can be understood from the figure that the average wall temperature increases with increase input power for each fill ratios.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Study of Wickless Heat Pipe with Flat Evaporator for Used in Cooling of Electronic Components

Adnan

Ahmad

Abdulrasool

2019

JUBES

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In this paper, systematic experimental investigations were carried out for a wickless heat pipe with flat evaporator having dimensions (100x100x30) mm. Flat-square electrical element was used to simulate the heat source of electronic part with dimensions of (100x100) mm. The aim of this paper presents the effect of fill ratio and cooling water mass flow rate on thermal performance of a wickless heat pipe. Experiments were performed to evaluate performance of wickless heat pipe for range of input power from 10 W to 100 W. The fill ratios used in the present work were 15%, 25%50% and 85%. The cooling water mass flow rate was also changed from 0.0083 kg/s to 0.033 kg/s. Experimental results showed that the maximum value of wall evaporator temperature was 115°C at input power of 100 W and a fill ratio of 15%. Results also showed that the maximum value of the total resistance was 0.8°C/W.

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Section: Resultsmentioning

confidence: 99%

“…Ahmad et al, [5] studied the effect of fill ratio and inclination angle on thermal performance of thermosyphon heat pipe by using a new CFD simulation. The results showed that the best fill ratio and inclination angle were 65% and 90°.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Wickless Heat Pipe with Flat Evaporator for Used in Cooling of Electronic Components

Adnan

Ahmad

Abdulrasool

2019

JUBES

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“…Computational fluid dynamic Ansys/Fluent 6.2, 13, and 15 have been used by researchers of different studies reported by References [21][22][23][24][25][26] to simulate the wickless heat pipe under different operating parameters, such as input heat flow, filling ratio, inclination angle, and different working fluids (water and R134a). All of these parameters have an effect on the performance of the wickless heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of closed‐loop thermosyphon with a different evaporator geometry

2020

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In this study, the effect of evaporator geometry on the loop thermosyphon's heat transfer coefficient is experimentally verified by using water as a working fluid with three filling ratios (50%, 70%, 90%), constant heat input (185 W), and condenser cooling water flow rate remaining constant at 2 Lpm. Three evaporator pipes are used (I: straight; II: helical coil evaporator with a diameter of 100-mm coil and two turns; III: helical coil evaporator with a diameter of 50-mm coil and four turns). From the experimental results, it can be observed that the performance of evaporator III is higher than the two other forms. A greater heat transfer coefficient value is found in case of type III evaporator and is equivalent to 2456 W/m 2 •°C. The maximum thermal resistance reduction occurs in the type III evaporator (37.32%), and the highest effective thermal conductivity for the same type is 6.123e + 05 W/m•°C. The experimental results demonstrate good agreement with the empirical equations.

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“…There are also several studies aimed to find the optimum filling ratio for different types of thermosiphons [7,8,9]. A team of researchers [10] investigated how the fill ratio and inclination angle is affecting the thermal performance of a thermosiphon. When the evaporator was filled to 65%, the thermal resistance of the gravitational heat pipe recorder the lowest value.…”

Section: Introductionmentioning

confidence: 99%

14. Experimental Investigation on the Optimum Filling Ratio of Heat Pipes Used for Heat Recovery Systems

Vizitiu¹,

Burlacu²,

Abid-David³

et al. 2020

Proceedings of International Conference Building Services and Energy Efficiency

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Thermal energy recovery plays an important part when it comes to increasing the energy efficiency of an industrial processes or of a building. The equipment used for heat recovery has undergone gradual improvements over time, one of the most significant being the introduction of heat pipes as part of their components. In order to optimize the functioning of heat recovery systems, it is important to use heat pipes suitable for the temperature and the nature of the heat source. This study consists of an experimental analysis of the filling ratios of copper heat pipes which are going to be used in the design of a heat recovery system. Distilled water is used as working fluid and the vacuum inside was made using a vacuum pump. A number of 20 heat pipes were designed and manufactured with 5 different filling ratios: 15 ml, 20 ml, 36 ml, 48 ml and 72 ml, the last one representing 50% of the internal volume of the shell. The evaporator of the heat pipes was introduced in hot water and the temperature variation on the adiabatic and the condenser zone was measured on different heights for one hour. The results showed that the tested thermosyphons have the best efficiency when the fill ratio is 25%.

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Numerical investigation of effect of fill ratio and inclination angle on a thermosiphon heat pipe thermal performance

Cited by 110 publications

References 26 publications

Experimental Study of Wickless Heat Pipe with Flat Evaporator for Used in Cooling of Electronic Components

Experimental Study of Wickless Heat Pipe with Flat Evaporator for Used in Cooling of Electronic Components

Experimental study of closed‐loop thermosyphon with a different evaporator geometry

14. Experimental Investigation on the Optimum Filling Ratio of Heat Pipes Used for Heat Recovery Systems

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