An experimental study on the heat transfer and pressure drop characteristics of electronics cooling heat sinks with FC-72 flow boiling

Kim, Chang Hoon; Lee, Min-Ju; Park, Chang Yong

doi:10.1007/s12206-018-0249-y

Cited by 13 publications

(3 citation statements)

References 76 publications

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“…Many of the researchers used Fluorinert FC-72 due to its physical properties and boiling point. The results from experimental studies on FC-72 flowing in a minichannel or microchannel set were discussed in [8][9][10][11][12]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The studies on heat transfer coefficient and pressure drop under different conditions of water were provided. The authors concluded that both coolants can be used to achieve a maximum heat dissipation rate of 100 W/cm 2 , whilst maintaining the maximum temperature of the heating wall below 90 • C. An experimental study on FC-72 and water flow boiling heat transfer and pressure drop in heat sinks with rectangular fins (two types) was presented in [10]. Under the same mass flow conditions for both types of heat sinks, similar values of heat transfer coefficient and pressure drop were observed.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software

2020

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This work focuses on subcooled boiling heat transfer during flow in a minichannel heat sink with three or five minichannels of 1 mm depth. The heated element for FC-72 flowing along the minichannels was a thin foil of which temperature on the outer surface was measured due to the infrared thermography. The test section was oriented vertically or horizontally. A steady state heat transfer process and a laminar, incompressible flow of the fluid in a central minichannel were assumed. The heat transfer problem was described by the energy equations with an appropriate system of boundary conditions. Several mathematical methods were applied to solve the heat transfer problem with the Robin condition to determine the local heat transfer coefficients at the fluid/heated foil interface. Besides the 1D approach as a simple analytical method, a more sophisticated 2D approach was proposed with solutions by the Trefftz functions and ADINA software. Finite element method (FEM) calculations were conducted to find the temperature field in the flowing fluid and in the heated wall. The results were illustrated by graphs of local heated foil temperature and transfer coefficients as a function of the distance from the minichannel inlet. Temperature distributions in the heater and the fluid obtained from the FEM computations carried out by ADINA software were also shown. Similar values of the heat transfer coefficient were obtained in both the FEM calculations and the 1D approach. Example boiling curves indicating nucleation hysteresis are shown and discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software

2020

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“…Above studies reveals that many researchers mainly focused on changing geometrical configuration of wavy microchannel for improvement in thermal performance of wavy microchannel. However, many experimental studies (Sui et al, 2011;Dalkılıç et al, 2017;Kim et al, 2018;Huang et al, 2018;Kewalramani et al, 2019) confirms that the thickness of microchannel is much higher than its channel height. Due to such higher thickness, there exists difference in wall temperature between two axial locations where temperature is higher towards the outlet.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of conjugate heat transfer in a single-phase flow in wavy and raccoon microchannels

Tiwari

Moharana

2019

HFF

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Purpose This paper aims to emphasize on studying various geometrical modification performed in wavy and raccoon microchannel by manipulating parameters, i.e. waviness (γ), expansion factor (α), wall to fluid thermal conductivity ratio (ksf), substrate thickness to channel height ratio (dsf) and Reynolds number (Re) for obtaining optimum parameter(s) that leads to higher heat dissipation rate. Design/methodology/approach A three-dimensional solid-fluid conjugate heat transfer numerical model is designed to capture flow characteristics and heat transfer in single-phase laminar flow microchannels. The governing equations are solved using finite volume method. Findings The results are presented in terms of average base temperature, average Nusselt number, pressure drop, dimensionless local heat flux, dimensionless wall and bulk fluid temperature, local Nusselt number and performance factor including axial conduction number. Heat dissipation rate with raccoon microchannel configuration is found to be higher compared to straight and wavy microchannel. With waviness of γ = 0.167, and 0.267 in wavy and raccoon microchannel, respectively, performance factor attains maximum value compared to other waviness for all values of Reynolds number. It is also found that the effect of axial wall conduction in wavy and raccoon microchannel is negligible. Additionally, thermal performance of wavy and raccoon microchannel is compared with straight microchannel. Practical implications In recent past years, much complex design of microchannel has been proposed for heat transfer enhancement, but the feasibility of available manufacturing techniques to fabricate complex geometries is still questionable. However, fabrication of wavy and raccoon microchannel is easy, and their heat dissipation capability is higher. Originality/value This makes the difference in wall and bulk fluid temperature smaller. Thus, present work highlighted the dominance of axial wall conduction on thermal and hydrodynamic performance of wavy and raccoon microchannel under conjugate heat transfer situation.

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Water spray heat transfer through a piezoelectric atomizer with a single-hole micronozzle

Hsieh

Huang

2020

J Mech Sci Technol

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An experimental study on the heat transfer and pressure drop characteristics of electronics cooling heat sinks with FC-72 flow boiling

Cited by 13 publications

References 76 publications

Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software

Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software

Comparative study of conjugate heat transfer in a single-phase flow in wavy and raccoon microchannels

Water spray heat transfer through a piezoelectric atomizer with a single-hole micronozzle

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