4.7 Article

Operation characteristics of a gravity pulsating heat pipe under different heat inputs

Related references

Note: Only part of the references are listed.
Article Thermodynamics

Heat transfer and flow visualization of pulsating heat pipe with silica nanofluid: An experimental study

Dongwei Zhang et al.

Summary: Adding nanoparticles in PHP can promote phase transition and increase fluid velocity and driving force, benefiting liquid reflux and avoiding 'dry out'. There is an optimum concentration of dispersed nanoparticles (1.0 wt%) in base fluid for enhancing heat transfer efficiency, reaching up to 40.1% at 50 W heating power.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

Article Thermodynamics

Experimental investigation on heat transfer and flow patterns of pulsating heat pipe assisted by ultrasonic cavitation

Dongwei Zhang et al.

Summary: This study investigated the effects of ultrasonic and nanofluid on the heat transfer performance of pulsating heat pipes (PHP). The results showed that increasing the power of ultrasonic enhanced the instantaneous velocity and driving force of the working fluid, while also shortening the startup time of the PHP. The collapse of cavitation bubbles and cavitation oscillation promoted the dispersion of nanoparticles, leading to improved heat transfer performance in high concentration nanofluid PHP.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

Article Mechanics

Experimental study of the flat plate pulsating heat pipe operation during dry-out and flow re-activation periods under microgravity conditions

Maksym Slobodeniuk et al.

Summary: An investigation was conducted on the thermal performances of a flat plate pulsating heat pipe (FPPHP) and the influence of liquid-vapor interface oscillation on the flow pattern inside the FPPHP under microgravity conditions. The experimental results show that the temperature rise in the evaporator zone during microgravity periods is mainly caused by the dry-out of the evaporator, and flow re-activation is rarely observed. The analysis of flow parameters and liquid plugs motion validates the classical criteria used for flow pattern definition in this case.

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW (2022)

Article Thermodynamics

Visualization of the working fluid in a flat-plate pulsating heat pipe by neutron radiography

Yosuke Yasuda et al.

Summary: Neutron radiography was used to visualize the behaviors of the working fluid in a flat-plate pulsating heat pipe made of aluminum alloy in bottom and top heating orientations. The results showed that the distribution of the working fluid does affect the startup characteristics of the PHP, with different heating orientations leading to different fluid behaviors.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

Article Thermodynamics

Synergy investigations for the thermal transportation performance of a coaxial gravity heat pipe with internally finned in evaporator section

Linjiang Zou et al.

Summary: Heat transfer performance of a coaxial gravity heat pipe (CGHP) was analyzed in this study. The effects of input powers, flow velocity, and the number of fins on thermal transport performance were investigated and validated by experiments and theoretical models. The influence of internal fins on liquid-vapor flow in the evaporator section was comprehensively obtained, providing insights for enhancing heat transfer capability.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

Article Thermodynamics

Visualization of Thermo-Hydrodynamic Behavior in Flat-Plate Pulsating Heat Pipe with HFE-347

Lipei Yan et al.

Summary: This paper experimentally investigates the visualization of thermo-hydrodynamic behavior in flat-plate pulsating heat pipe (FP-PHP) with HFE-347. The study reveals that the flow patterns in FP-PHP with medium (40%-60%) and high (70%) filling rate are dominated by mixed flow at high heating power (100 W to 140 W), while at moderate heating power (60 W to 80 W), wall temperature fluctuates greatly due to the uncertainty of flow direction. The temperature distribution of the FP-PHP is highly affected by the heat transfer intensity of the working fluid under different flow states.

JOURNAL OF THERMAL SCIENCE (2021)

Article Thermodynamics

Investigation of flat plate type pulsating heat pipes via flow visualization-assisted experiments: Effect of cross sectional ratio

Burak Markal et al.

Summary: The combined influence of filling ratio, geometry, inclination angle, and heating power on heat transfer characteristics of pulsating heat pipes (PHPs) was investigated in this study, revealing the key roles of phase change phenomena and bubble dynamics in the thermal characteristics. It was concluded that non-uniform design can improve the operational performance of non-uniform PHPs by reducing the influence of gravity on the results.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2021)

Article Physics, Multidisciplinary

Enhanced pool boiling heat transfer on soft liquid metal surface

Cao Chun-Lei et al.

Summary: Soft surfaces effectively enhance pool boiling heat transfer performance by increasing nucleate site density, reducing bubble departure diameter, and increasing bubble departure frequency. Additionally, soft surfaces exhibit smaller surface energy changes and potential barriers before and after bubble departure, making bubble separation easier, and elastocapillary wave and bubble jet phenomena contribute to the enhancement of pool boiling heat transfer.

ACTA PHYSICA SINICA (2021)

Article Thermodynamics

Experimental investigations of heat transfer mechanisms of a pulsating heat pipe

Jaeyeong Jo et al.

ENERGY CONVERSION AND MANAGEMENT (2019)

Article Thermodynamics

Heat transfer performance of pulsating heat pipe with zeotropic immiscible binary mixtures

Rongji Xu et al.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2019)

Review Metallurgy & Metallurgical Engineering

A review on application of nanofluid in various types of heat pipes

Mohammad Alhuyi Nazari et al.

JOURNAL OF CENTRAL SOUTH UNIVERSITY (2019)

Article Engineering, Chemical

Particle size and type effects on heat transfer enhancement of Ferro-nanofluids in a pulsating heat pipe

Hamid Reza Goshayeshi et al.

POWDER TECHNOLOGY (2016)

Article Thermodynamics

Effect of magnetic field on the heat transfer rate of kerosene/Fe2O3 nanofluid in a copper oscillating heat pipe

H. R. Goshayeshi et al.

EXPERIMENTAL THERMAL AND FLUID SCIENCE (2015)

Article Thermodynamics

Thermomechanical finite-element analysis and dynamics characterization of three-plug oscillating heat pipes

P. Frank Pai et al.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2013)

Article Thermodynamics

Experimental study on effective range of miniature oscillating heat pipes

Zirong Lin et al.

APPLIED THERMAL ENGINEERING (2011)

Article Thermodynamics

A Dynamic Film Model of the Pulsating Heat Pipe

Vadim S. Nikolayev

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME (2011)

Article Thermodynamics

Experimental Study on the Start Up Performance of Flat Plate Pulsating Heat Pipe

Chaofa Hu et al.

JOURNAL OF THERMAL SCIENCE (2011)

Article Thermodynamics

Flow and heat transfer of liquid plug and neighboring vapor slugs in a pulsating heat pipe

Dazhong Yuan et al.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2010)

Article Thermodynamics

Operational limit of closed loop pulsating heat pipes

Honghai Yang et al.

APPLIED THERMAL ENGINEERING (2008)