A One-Dimensional Model of a Micro Heat Pipe During Steady-State Operation

Longtin, Jon P.; Badran, Bassam E.; Gerner, Frank M.

doi:10.1115/1.2910926

Cited by 140 publications

(72 citation statements)

References 3 publications

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“…Following Cotter [10], Longtin et al [24] carried out a one-dimensional analysis of a micro heat pipe operating under steady state conditions. They used the governing equations of Laplace-Young, conservation of mass, momentum and energy; and obtained a set of five first-order, nonlinear, coupled ordinary differential equations.…”

Section: Evolution Of Modelsmentioning

confidence: 99%

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Geometric optimization for a thermal microfluidic chip

Rahmat

Hubert

2010

J Mech Sci Technol

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During the past two decades, thermal microfluidic chips have significantly been investigated. Due to their high capacity of heat transport, an increasing number of studies on different aspects of thermal microfluidic chips have been conducted.However, a comprehensive investigation on the geometry of microfluidic chips using state of the art finite element software is absent from the literature. In this thesis, geometric parameters of thermal microfluidic chips have been optimized, using finite element software. Consequently, micro and macro phenomena were

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Section: Evolution Of Modelsmentioning

confidence: 99%

“…From Longtin et al [24] the cross-sectional area for liquid and vapour, as well as the interface area of liquid, vapour, and the wall can be defined. …”

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confidence: 99%

Geometric optimization for a thermal microfluidic chip

Rahmat

Hubert

2010

J Mech Sci Technol

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“…From the output of the experiment using MHP with woven wire wicks was found to be quiet viable candidate for a stable cooling unit of Notebook P. C. Babin et al [11] developed the model that analyzes the heat transport behavior of micro-heat pipe, and presented the model of micro-heat pipe based on the analysis by Chi [12] in a steady-state operation. Longtin et al [13] presented the improved prediction results, considering partially the shear stress in liquid-vapor interface of groove in a micro heat pipe. Swanson and Peterson [14] analyzed thermo-dynamically the heat transport phenomena in the liquid-vapor interface of heat pipe, and Wu and Peterson [15] studied the thermal performance of micro-heat pipe in an unsteady state.…”

Section: Introductionmentioning

confidence: 99%

Study of Two-Metal (Cu-Ag) Micro Heat Pipe of Square Cross Section Using Different Liquids of Low Boiling Point

Iqbal¹,

Akhanda²

2014

AJME

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The efficiency-to-size ratio of the electronic machines has been increasing rapidly while leaving the electronics highly thermally stressed. In an attempt to solve the overheating issue, a comparative study is conducted between a two-metal (Cu-Ag) micro heat pipe and the contemporary single-metal one (Cu) which is currently being installed in the electronic equipment. Thermal effects of a two-metal square cross section micro heat pipe (MHP) at steady state are experimentally investigated. It is a 150 mm long square hollow tube having each side of 3.6 mm and thickness of 0.3 mm which holds a 3.0 mm hollow space axially. The evaporator and condenser sections are made of pure copper and silver respectively while the adiabatic section is made of both copper and silver. Water and three low boiling point liquids ─ ethanol, methanol and iso-propanol ─ are used as working fluids. In view of the usage of the actual equipment, tests are conducted by placing the heat pipe at three different inclinations of 0 o , 45 o and 90 o . To provide heat flux, an electric heater-coil has been wrapped around the evaporator simulating the heat-generation within an actual device, and simultaneously the condenser section is directly cooled by ambient water in an annular space. Internal fluid-flow is considered to be one dimensional. Ten K-type thermocouples are installed at different locations ─ five of them are to measure the temperatures of internal fluid and five are used to measure the surface temperatures of the tube. Temperatures are monitored by digital electronic thermometers. Unlike in the single-metal micro heat pipe (SMMHP), it is found that the super heater effect in the evaporator of TMMHP simplify the complex two-phase flow into a superheated vapor. Thus, it increases TMMHP's heat transfer capability multiple times higher than that of SMMHP.

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“…Theoretical models are based on previous works developed for micro heat pipes. Among these articles, the model of Longtin et al (1994) has been the basis of numerous other hydrodynamic models, which are based on the Young-Laplace law and the balance equations. These models describe the liquid and vapor pressures and velocities, as well as the meniscus curvature radius and thus the shape of the liquid inside the micro heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Evaporation and Condensation Processes Specific to Grooved Flat Heat Pipes

Lefèvre¹,

Lips²,

Bonjour³

2010

Frontiers in Heat Pipes

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Temperature and liquid-vapor interface measurements obtained with a flat plate heat pipe (FPHP) in various experimental conditions are presented. The grooved FPHP is made of copper. The results are compared to a thermal model, developed in a previous work, in which heat conduction in the FPHP wall as well as evaporation and condensation heat transfer phenomena are taken into account. The model depends on the shape of the liquidvapor interface in the grooves and on the fins at the condenser. A good agreement is found between the evaporation model and the experimental data. However the results of the condensation model overestimate the heat transfer coefficient, due to a bad estimation of the condensate film on the fins. Experimental measurements obtained with a second FPHP made of silicon are used to analyze the shape of this film. For both evaporation and condensation models, the results show a strong influence of the accommodation coefficient.

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A One-Dimensional Model of a Micro Heat Pipe During Steady-State Operation

Cited by 140 publications

References 3 publications

Geometric optimization for a thermal microfluidic chip

Geometric optimization for a thermal microfluidic chip

Study of Two-Metal (Cu-Ag) Micro Heat Pipe of Square Cross Section Using Different Liquids of Low Boiling Point

Investigation of Evaporation and Condensation Processes Specific to Grooved Flat Heat Pipes

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