Experimental study on the performance characteristics of a cylindrical heat pipe having a screen wick subject to multiple heat sources

Boo, Joon Hong; Kim, Hyun Gon

doi:10.1016/j.applthermaleng.2017.02.097

Cited by 21 publications

(12 citation statements)

References 11 publications

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“…On the contrary, the air cooling technique maintained stack temperature by controlling the amount of forced convection air, which can only discharge the generated heat. Moreover, the thermal conductivity of air was lower than heat pipe, which resulted in a highertemperature gradient across the working area [13,28]. The maximum temperature gradient in the working area is the temperature between the core of stack and corner of the outermost cell.…”

Section: Cooling Processmentioning

confidence: 99%

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Thermal management of high temperature polymer electrolyte membrane fuel cells by using flattened heat pipes

Sasiwimonrit

Chang

2021

THERM SCI

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High-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) is a clean energy conversion device that generates electricity directly from the electrochemical reaction. Since the working temperature is about 160 ?C, the heating and cooling mechanisms are critical factors to maintain the optimal working condition and prevent the cell from degradation. Simulation models of HT-PEMFC were built for investigating the temperature distribution on the working area of fuel cells and temperature gradient across the stack. The ordinary method of heating by using heating pads and cooling by applying forced convection air was compared with the heat pipe heating and cooling technique. The results showed that heat pipe provided a more uniform temperature distribution and current density across the fuel cells stack. The temperature gradient of 0.214?C/cell during heating and 0.054?C/cell during cooling processes were observed. Meanwhile, only 0.44 mA cm-2/cell of current density gradient was found.

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Section: Cooling Processmentioning

confidence: 99%

“…The condensed working fluid returns to the evaporator section through the wick structure by capillary force. The thermal conductivity of heat pipe is approximately 500 times higher than a solid copper rod [13]. It had been applied to many applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

Thermal management of high temperature polymer electrolyte membrane fuel cells by using flattened heat pipes

Sasiwimonrit

Chang

2021

THERM SCI

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“…A significant problem that affects the performance of a heat pipe can arise when the evaporator configuration is changed from SHS to MHS. This problem was addressed by Boo et al [18] when they compared SHS configuration to MHS configuration with five, equal and unequal loaded, evaporators. At higher thermal loads (300 W), the thermal resistance of the heat pipe increased by up to 40% as it was changed from SHS to MHS with equal loads.…”

Section: Figure 1: An Mhs Heat Pipe Configuration Illustrating the Po...mentioning

confidence: 99%

“…To date, studies on MHS configurations have mainly focused on sources arranged in either a column or row [18,19]. These studies are somewhat incomplete representations of practical applications in electronics cooling.…”

Section: Figure 1: An Mhs Heat Pipe Configuration Illustrating the Po...mentioning

confidence: 99%

“…In total, eight MHS configurations were tested and compared to a base SHS configuration. The apparatus was initially used to verify that the thermal performance of the heat pipe was reduced when changing from SHS to MHS, as per the literature [18]. Then, the effects of implementing a bend (0-90°) were investigated.…”

Section: Figure 1: An Mhs Heat Pipe Configuration Illustrating the Po...mentioning

confidence: 99%

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Analysis of Sintered Wicked Heat Pipes for Space-Constrained Multiple Component Cooling

Mooney

Egan

Quinlan

et al. 2021

IEEE Trans. Compon., Packag. Manufact. Technol.

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Contemporary electronic cooling applications can feature complex heat pipe configurations with multiple heat sources (MHS), and one or more bends in various locations to meet physical constraints. It is typically understood that implementing a bend or adding MHS to a heat pipe that was tested for a straight single heat source (SHS) heat pipe can degrade thermal performance. However, the severity of combining the two phenomenon and the effects of changing the location of a bend in a MHS heat pipe are unknown. In this context, this study presents an experimental investigation of the thermal performance of four configurations for 400 mm long, 6 mm diameter; cylindrical copper sintered heat pipes, where small, heated copper saddles are configured as evaporators: a pipe with a SHS; a pipe with MHS; an MHS heat pipe with an increasing bend angle from 0° -90°; and an MHS heat pipe where the location of a 90° bend is moved along the axis. The results demonstrate that a bent MHS heat pipe does not act in a similar manner to a conventional SHS heat pipe or a straight MHS heat pipe. It was found that the thermal resistance increases by up to 65% when the configuration is changed from SHS to MHS, and bend angle is found to increase the resistance by a further 15-65%. For the MHS cases, bend location induces resistance increases of ~5-18%. Furthermore, the optimum bend location for the MHS case is found to be adjacent to the middle evaporator (of five), for cases in which the heat load is evenly distributed before and after the bend. The results suggest that the combination of MHS, bend angle and bend location have unique effects on the fluid transport mechanisms inside the heat pipe and, thus, thermal performance changes between bend location configurations. Therefore, it is concluded that a bent MHS heat pipe configuration should not be designed on the basis of the thermal characteristics for straight SHS heat pipes.

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Opportunities, challenges, and state of the art of flexible heat‐pipe heat exchangers: A comprehensive review

V. K.

2023

Heat Trans

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Heat pipes (HPs) play a pivotal role in efficiently managing the thermal challenges posed by high heat flux devices. To facilitate their operation at extremely low temperatures, specialized working fluids with low‐boiling points are a necessity. HPs serve as efficient heat exchanger (HEX) in diverse applications, such as heat pumps and heat‐transfer components. In the realm of space applications, HP is indispensable for cooling electronic components within two‐phase thermal control systems. Notably, the recent significant reduction in HP production costs has paved the way for synergizing HP with HEX, promising substantial energy savings. This comprehensive review centers its focus on the advancements in HEX‐based flexible HP systems. It critically evaluates various performance models and investigates key findings from a multitude of literature papers that pertain to HEX applications. The review encompasses a wide spectrum of innovations, including conventional, pulsating, and thermosyphons (gravity‐assisted) in HEX. It further explores studies on recuperative and regenerative HEX configurations. The surveyed literature underscores the critical role played by the choice of operating fluid and heat load in significantly influencing HP performance. This study offers a comprehensive understanding of key outcomes, strengths, limitations, and specific applications of HP and HEX. The review also highlights the significance of operating fluid selection and considerations related to heat load while outlining exciting opportunities for future research in this domain. Moreover, it introduces several novel concepts for future studies in pertinent domains, offering promising directions for further exploration within this field.

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Experimental study on the performance characteristics of a cylindrical heat pipe having a screen wick subject to multiple heat sources

Cited by 21 publications

References 11 publications

Thermal management of high temperature polymer electrolyte membrane fuel cells by using flattened heat pipes

Thermal management of high temperature polymer electrolyte membrane fuel cells by using flattened heat pipes

Analysis of Sintered Wicked Heat Pipes for Space-Constrained Multiple Component Cooling

Opportunities, challenges, and state of the art of flexible heat‐pipe heat exchangers: A comprehensive review

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