Effect of Inner Diameter and Inclination Angles on Operation Limit of Closed-Loop Oscillating Heat-Pipes with Check Valves

Meena, P.; Rittidech, S.; Tammasaeng, P.

doi:10.3844/ajeassp.2008.100.103

Cited by 12 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Without this pumping action, the device will operate as a solid bar conducting heat from one end to another. Characterization of thermal performance in multi-loop PHPs has been reported in few experimental investigations done by Cai [5], Charoensawan et al [6], Khandekar [7,8] and Meena et al [9]. Earlier, sensible heat transfer was thought of as the main reason of it which was shown by Groll [10], Nisho et al [11] and Shafi et al [12].…”

Section: Introductionmentioning

confidence: 94%

Effect of Fin and Insert on the Performance Characteristics of Open Loop Pulsating Heat Pipe (OLPHP)

Rahman¹,

Mir²,

Nawrin³

et al. 2015

Procedia Engineering

View full text Add to dashboard Cite

The pulsating heat pipe, a serpentine tube of capillary dimension with many turns, has great impact on today's successful thermal management. It is an ascending technology to satisfy present requirement of increasing thermal performance. Focusing on this, an experiment has been done on the open loop pulsating heat pipes (OLPHP) to observe their performance characteristics by using two types of working fluid by varying inclination angles. The experiment is performed on 2.5 mm inner diameter and 3 mm outer diameter OLPHP with an insert of copper wire of 1 mm diameter and fins are added on the condensation section. This investigation is done using methanol and ethanol with 50% filling ratio in OLPHP with 8 loops. In this experiment the effects on the performance of using fins with insert with two different fluids (methanol and ethanol) and the variation of inclination angles are investigated. The results show that the performance characteristics in all the circumstances are better for setup with fin and insert than the normal setup. As higher thermal resistance indicates better performance, so we can say that setup with methanol performs better than ethanol. This performance is best at 45˚ inclination angle. It can be seen that, higher the inclination angle, better the performance and this performance is best at 45˚ inclination angle for this experiment.

show abstract

Section: Introductionmentioning

confidence: 94%

Effect of Fin and Insert on the Performance Characteristics of Open Loop Pulsating Heat Pipe (OLPHP)

Rahman¹,

Mir²,

Nawrin³

et al. 2015

Procedia Engineering

View full text Add to dashboard Cite

show abstract

“…Meena et al [7] in 2008 used check valve operated closed loop oscillating heat pipes (CLHOP-CV) made up of copper tubes with R123 as working fluid to study the effect of different tilt angles and internal diameters. The fliing ratio inside the evaporator section was fixed at 50% and lengths of all 3 sections of heat pipe were same.…”

Section: Study Of Heat Pipes At Differentmentioning

confidence: 99%

A Review of Performance of Heat Pipes at Different Inclinations

Singh¹,

Sharma²,

Gangacharyulu³

2017

IJERT

View full text Add to dashboard Cite

Heat Pipe are the superconductors of heat because of their fantastic heat handling and transporting ability with minimum heat loss. A lot of research and experimentation has been carried out on heat pipes in the 21 st century due to modernization and miniaturization of equipments. This review aims to collect and compile research works by various authors in the field of heat pipe, where they have studied the performance of heat pipe under different tilt angles or inclinations. Gravitational and capillary forces play a very important role in deciding the overall performance of a heat pipe. At every different inclination, the resultant of these two forces varies, so the efficiency of a heat pipe also varies. This is the reason why there is a need to thoroughly study the performance of heat pipes at different inclinations.

show abstract

“…[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]. Results on thermal performance of single loop PHP are also investigated by Rama Narasimha et al [10,11].…”

Section: Introductionmentioning

confidence: 95%

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

View full text Add to dashboard Cite

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.

show abstract

Effect of Inner Diameter and Inclination Angles on Operation Limit of Closed-Loop Oscillating Heat-Pipes with Check Valves

Cited by 12 publications

References 6 publications

Effect of Fin and Insert on the Performance Characteristics of Open Loop Pulsating Heat Pipe (OLPHP)

Effect of Fin and Insert on the Performance Characteristics of Open Loop Pulsating Heat Pipe (OLPHP)

A Review of Performance of Heat Pipes at Different Inclinations

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

Contact Info

Product

Resources

About