Simulation and Experimental Investigation of Thermal Performance of a Miniature Flat Plate Heat Pipe

Boukhanouf, Rabah; Haddad, Assed

doi:10.1155/2013/474935

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…Thus, the larger aspect ratio leads to pool boiling, which occurs with the highest heat transfer rate. However, the phenomenon has approached an inside of confine channel within lower heat transfer rate [12,[15][16][17]. The aspect ratio can be defined with the following equation:…”

Section: Vapour Chambermentioning

confidence: 99%

Loop Thermosyphon with Vapour Chamber: A Thermodynamic Study

Jengsooksawat

Rittidech

Booddachan

2014

Advances in Mechanical Engineering

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This research presents a case study of the rating heat transfer of a loop thermosyphon with a vapour chamber (LTVC). The dimensions of the evaporator chamber were 200 × 200 × 55, 200 × 200 × 65 and 200 × 200 × 75 mm ( × × ). The adiabatic and condenser section had an 8-loops thermosyphon. The length of the adiabatic and condenser section in each loop was 824 and 800 mm, respectively. The air velocity was 0.5, 1.0, and 1.5 m/s with the heat input being 600, 900, and 1,200 W. The three working fluids were: water, ethanol, and R-11 with filling ratios of 20, 40, and 60% with respect to the chamber volume. The experimental data showed that the LTVC yielded the value of the relative thermal efficiency of about 1 at R-11, a filling ratio of 60%, a velocity of 0.5 m/s, and an aspect ratio of 2.5 in the study conditions. It was further found that the larger vapour chamber was superior in the rating of the heat transfer over other vapour chambers in all experimental conditions in this study.

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Section: Vapour Chambermentioning

confidence: 99%

Loop Thermosyphon with Vapour Chamber: A Thermodynamic Study

Jengsooksawat

Rittidech

Booddachan

2014

Advances in Mechanical Engineering

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“…The diagram shows that the temperature gradients of the mini heat pipe are less than the temperature of the plate of copper. As illustrated in Figure (6), the process lowers the temperature slope gradient of the flat mini heat pipe and this gives Figure (7) shows the flat mini heat pipe's effective thermal resistance versus the thermal input power and the thermal resistance has great value at low heat flux as stout liquid film located in the evaporator zone. From the Figure, it is clear that thermal resistance gradually decreases to its lowest value when the heat flux value reaches its highest value and when the thermal input power increases more than the limit of the capillary the thermal resistance begins to increase as the evaporator is almost devoid of liquid.…”

Section: Variation Of Nusselt Numbermentioning

confidence: 99%

“…The influence of the main variables on which the flat miniature heat pipe depends can be calculated by experimental investigation. Thus, the impact of the working fluid, the interaction between vapour and the base fluid, the capillary channel geometry and hydraulic diameter can be calculated by analysing the thermal and hydrodynamic boundary layer of the selected test section [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of forced convective heat transfer and fluid flow in a mini heat pipe with rectangular micro grooves

MAJEL,

OBAID

2024

Journal of Thermal Engineering

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In the present study, the convective heat transfer coefficient of water in a laminar flow regime under constant inlet temperature conditions inside a flat mini heat pipe was investigated ex-perimentally. Heat flux ranged from 20-50W and various horizontal heat sink temperatures (operating temperature) ranged from 15-35°C with liquid flow rate (3.563E-8 m3/sec) used during the experiments. The rectangular microchannels performance is evaluated in terms of the temperature profile, heat transfer coefficient, Nusselt number and thermal resistance. The results emphasized that the mini heat pipe temperature gradients are less than the tempera-ture of the copper plate and the heat resistance gradually decreases to its lowest value when the heat flux value reaches its highest value if it does not exceed the capillary limits. The data also demonstrated that the coefficient of heat transfer in the condensation zone is lower than in the evaporation zone at different heat sink temperatures. The augmentation rate for the flat mini heat pipe thermal conductivity reached about 240% at a heat load 30W for the positions of thermosyphon and horizontal, while the rate of increase in the case of the anti-gravity situ-ation at a heat load 30W reaches 210%, then the improvement percentage begins to decrease to 200%. A generalized regression equation is developed for the estimation of the Nusselt number valid for water in a flat mini heat pipe.

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“…In this article, three kinds of calculation models of the first interface micro-gap width are introduced. The calculation and derivation methods of model I and model II are different, and the third model (comprehensive Based on the literatures, [11][12][13] the calculation model DI of micro-gaps resulted from casing heating and cooling is derived. The model is written as…”

Section: Calculation Model I Of the First Interface Micro-gapsmentioning

confidence: 99%

Calculation and analysis of the first interface micro-gaps of the thermal production wells

Yong

Liang

et al. 2017

Advances in Mechanical Engineering

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Heavy oil is an important oil resource. The main development method is thermal exploitation-steam stimulation. Drastic variation in temperature will result in thermally induced micro-gaps in the first interface during steam stimulation. The existence of micro-gaps will cause steam channeling in the hole and difficulty in engineering logging interpretation. According to the stress of casing string of thermal production wells and thermal injection model, the mechanical model of casing string of thermal production wells is divided into four intervals for further analysis, including the wellhead movement extension interval, the extension and compression movement interval between low-temperature zones, the packer movement interval, and the extension and compression movement interval between perforation sections. For different casing string intervals, two types of mathematical models of first interface micro-gap width are established. In order to comprehensively evaluate the micro-gaps, the mathematical model comprehensively evaluating cement sheath micro-gaps is established through superposition and geometric mean of two models. The models can be used to calculate the first interface micro-gap width of different intervals. In addition, the tri-strata axial symmetric finite element model of first interface with micro-gap is established, and the variation in temperature field, stress field, and width of micro-gap interval of wellbore is analyzed, which provides the theoretical basis for evaluation of micro-gaps.

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Simulation and Experimental Investigation of Thermal Performance of a Miniature Flat Plate Heat Pipe

Cited by 6 publications

References 17 publications

Loop Thermosyphon with Vapour Chamber: A Thermodynamic Study

Loop Thermosyphon with Vapour Chamber: A Thermodynamic Study

Experimental investigation of forced convective heat transfer and fluid flow in a mini heat pipe with rectangular micro grooves

Calculation and analysis of the first interface micro-gaps of the thermal production wells

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