Flexible Air Cooled Loop Heat Pipe for High Density Avionics Cooling

Thayer, John; Hall, G.

doi:10.2514/6.2006-3413

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…This allows, the heat transfer in the heat pipes to be simulated using an effective heat conductivity. The same modeling strategy for heat pipes has been presented in the literature and shown to give accurate results [40]. This was also validated by measurements of heat flow in heat pipes for the temperatures relevant for the system, which shows all conditions are far from being controlled by the internal heat transfer rate inside the heat pipes.…”

Section: Boundary Conditions and Materials Datamentioning

confidence: 59%

Multiphysics CFD Simulation for Design and Analysis of Thermoelectric Power Generation

Högblom

Andersson

2020

Energies

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The multiphysics simulation methodology presented in this paper permits extension of computational fluid dynamics (CFD) simulations to account for electric power generation and its effect on the energy transport, the Seebeck voltage, the electrical currents in thermoelectric systems. The energy transport through Fourier, Peltier, Thomson and Joule mechanisms as a function of temperature and electrical current, and the electrical connection between thermoelectric modules, is modeled using subgrid CFD models which make the approach computational efficient and generic. This also provides a solution to the scale separation problem that arise in CFD analysis of thermoelectric heat exchangers and allows the thermoelectric models to be fully coupled with the energy transport in the CFD analysis. Model validation includes measurement of the relevant fluid dynamic properties (pressure and temperature distribution) and electric properties (current and voltage) for a turbulent flow inside a thermoelectric heat exchanger designed for automotive applications. Predictions of pressure and temperature drop in the system are accurate and the error in predicted current and voltage is less than 1.5% at all exhaust gas flow rates and temperatures studied which is considered very good. Simulation results confirm high computational efficiency and stable simulations with low increase in computational time compared to standard CFD heat-transfer simulations. Analysis of the results also reveals that even at the lowest heat transfer rate studied it is required to use a full two way coupling in the energy transport to accurately predict the electric power generation.

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Section: Boundary Conditions and Materials Datamentioning

confidence: 59%

Multiphysics CFD Simulation for Design and Analysis of Thermoelectric Power Generation

Högblom

Andersson

2020

Energies

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“…Their high pumping capability, excellent heat transfer performance and flexible thermal link function have been traditionally utilized to address the thermal-management problems of spacecraft, and successfully applied in many space tasks [3][4][5][6][7][8][9][10][11]. With the continuous development of LHP technology in space applications, more recently, its application has been extended to terrestrial surroundings such as in high heat flux electronics cooling [12][13][14][15][16] and thermal-management systems for aircraft and submarines [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of evaporator tilt on the operating temperature of a loop heat pipe without a secondary wick

Bai

Lin

Zhang

et al. 2014

International Journal of Heat and Mass Transfer

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Abstract:The effect of evaporator tilt on the operating temperature of a loop heat pipe (LHP) without a secondary wick under terrestrial surroundings was investigated both experimentally and theoretically in this work. The experiments were conducted with the evaporator placed at three different tilts: (i) the evaporator was horizontal with the compensation chamber (CC), (iii) the evaporator was vertically below the CC, and (iii) the evaporator was higher the CC with a tilt angle of xx. The experimental results show that the evaporator tilt has significant effect on the operating temperature of the LHP: the operating temperature of the case iii) was much higher than the other two cases.A mathematical model including a two-zoned evaporator wick, i.e. a subcooled zone and a saturated zone, was built and solved, which agreed well with the experimental observation. . The results showed that the cooling effect of the returning liquid on the vapor region in the CC or evaporator core is crucial in determining the operating temperature of LHPs..

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