Numerical analyses on heat transfer characteristics of ultra-thin heat pipes: Fundamental studies with a three-dimensional thermal-fluid model

Koito, Yasushi

doi:10.1016/j.applthermaleng.2018.10.119

Cited by 16 publications

(20 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The numerical results of pv at z = h/2 on the vapor-liquid interface are shown in this figure. Under the same heat inputs, as mentioned in the author's previous paper (Koito, 2019), the vapor velocity becomes higher as the cross section (= wv × h) of the vapor flow space decreases. Therefore, the vapor pressure difference over the vapor region became larger as h decreased.…”

Section: Results Of Three-dimensional Numerical Analysesmentioning

confidence: 64%

“…Details of mathematical modeling were already described in the author' previous paper (Koito, 2019). Therefore, its brief summary is described below.…”

Section: Mathematical Model and Numerical Conditionsmentioning

confidence: 99%

“…In this experiment, a length, a width and a thickness of the heat pipe were changed as 50 mm -120 mm, 3.0 mm -7.8 mm and 0.35 mm -0.60 mm, respectively. Recent studies concerning the ultra-thin flattened heat pipes were already reviewed in the author's previous paper (Koito, 2019). In addition, Tang et al (2017) fabricated a novel sintered copper mesh wick and Zhou et al (2019) developed a novel bi-porous spiral woven mesh wick in order to enhance the thermal performance of the ultra-thin flattened heat pipes.…”

Section: Introductionmentioning

confidence: 99%

“…Since the vapor pressure drop would influence the heat pipe performance, the discussion concerning the vapor pressure drop is indispensable for further development of ultra-thin heat pipes. In the previous study (Koito, 2019), therefore, the author developed a three-dimensional mathematical model to clarify the velocity, pressure and temperature distributions in the ultra-thin heat pipe. By using the experimental results by Zhou et al (2017), the confirmation was obtained on the validity of the mathematical model.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Analyses on Vapor Pressure Drop in a Centered-Wick Ultra-Thin Heat Pipe

Koito¹

2019

Frontiers in Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

This paper describes extended numerical analyses on vapor pressure distribution in a centered-wick ultra-thin heat pipe. Analyses were conducted by using a three-dimensional model developed by the author. Numerical results were obtained changing design parameters and operating conditions of the heat pipe. Discussion was made on the heat transfer limit as well as the vapor pressure drop. Moreover, a simple method was also presented to evaluate the vapor pressure drop in the ultra-thin heat pipe. Calculated results with the simple method agreed in 10 % with the three-dimensional numerical results.

show abstract

Section: Results Of Three-dimensional Numerical Analysesmentioning

confidence: 64%

“…Details of mathematical modeling were already described in the author' previous paper (Koito, 2019). Therefore, its brief summary is described below.…”

Section: Mathematical Model and Numerical Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Analyses on Vapor Pressure Drop in a Centered-Wick Ultra-Thin Heat Pipe

Koito¹

2019

Frontiers in Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…Their heat pipe had a five-turn meandering rectangular channel with a hydraulic diameter of 550 m. The other recent studies on ultra-thin heat pipes were reviewed in the author's previous papers (Koito, 2019a;Koito, 2019b). Usually, ultra-thin heat pipes are used in the thermal management of smartphones.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Analysis on the Effect of Deviation From a Centered Wick Structure in an Ultra-Thin Flattened Heat Pipe

Koito¹

2021

Frontiers in Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

For ultra-thin heat pipes, a centered wick structure is often used. In this study, a numerical analysis is performed on an ultra-thin heat pipe in which the wick structure's position has deviated from the center. A 3D heat pipe model, developed by the author in a previous study, is extended, and numerical calculations are conducted to determine any differences in performance because of an off-center wick. The major findings are as follows: (1) a completely centered wick structure is recommended for optimum performance;(2) accurate central positioning of the wick structure is important in the fabrication process of ultra-thin heat pipes.

show abstract

A critical review on renewable battery thermal management system using heat pipes

Afzal

Razak

Samee

et al. 2023

J Therm Anal Calorim

View full text Add to dashboard Cite

The critical review presented here exclusively covers the studies on battery thermal management systems (BTMSs), which utilize heat pipes of different structural designs and operating parameters as a cooling medium. The review paper is divided into five major parts, and each part addresses the role of heat pipes in BTMS categorically. Experimental studies, numerical analyses, combined experimental and numerical investigations, optimum utilization of a phase-change material (PCM) with a heat pipe (HP), oscillating heat pipe (OHP), and micro heat pipes combined with PCM for Li-ion BTMS using heat pipes are presented. The usage of HP’s and PCM can keep the temperature of the battery system in the desirable limit for a longer duration compared to other traditional and passive methods. More emphasis is made on how one can achieve a suitable cooling system design and structure, which may tend to enhance the energy density of the batteries, improve thermal performance at maximum and minimum temperature range. Arrangement of battery cells in a pack or module, type of cooling fluid used, heat pipe configuration, type of PCM used, working fluid in a heat pipe, and surrounding environmental conditions are reviewed. According to the study, the battery's effectiveness is significantly influenced by temperature. The usage of flat HPs and heat sink proves to be the best cooling method for keeping the battery working temperature below 50 °C and reduces the heat sink thermal resistance by 30%. With an intake temperature of 25 °C and a discharge rate of 1 L per minute, an HP that uses water as a coolant is also effective at regulating battery cell temperature and maintaining it below the permissible 55 °C range. Using beeswax as a PCM in HPs reduces the temperature of BTMS by up to 26.62 °C, while the usage of RT44 in HPs reduces the temperature of BTMS by 33.42 °C. The use of fins along with copper spreaders drastically decreases the temperature capability of HPTMS by 11 °C. MHPA shows excellent performance in controlling the battery temperature within 40 °C. The effective thermal management can be done by incorporating heat pipe alone or by coupling with liquid cooling or metal plate. However, extensive and extended research is required to improve thermal management to safely and effectively use the battery for day-to-day applications.

show abstract

Numerical analyses on heat transfer characteristics of ultra-thin heat pipes: Fundamental studies with a three-dimensional thermal-fluid model

Cited by 16 publications

References 17 publications

Numerical Analyses on Vapor Pressure Drop in a Centered-Wick Ultra-Thin Heat Pipe

Numerical Analyses on Vapor Pressure Drop in a Centered-Wick Ultra-Thin Heat Pipe

A Numerical Analysis on the Effect of Deviation From a Centered Wick Structure in an Ultra-Thin Flattened Heat Pipe

A critical review on renewable battery thermal management system using heat pipes

Contact Info

Product

Resources

About