Heat Pipes and Thermosyphons

Faghri, Amir

doi:10.1007/978-3-319-26695-4_52

Cited by 7 publications

(3 citation statements)

References 107 publications

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“…The vapor then moves along the heat pipe to the cold interface, called the condenser, releases latent heat, and condenses back into liquid. The liquid then returns to the hot interface via capillary action, but the shapes of Figures 1a and 1b are different [5,6]. The liquid circulation process is slightly different from that of a conventional heat pipe, as described in Figure 1b.…”

Section: Introductionmentioning

confidence: 97%

“…The changed liquid is operated repeatedly, by returning it to the evaporator through various forms of force using the capillary force, gravity, centrifugal force, electrostatic force, osmotic pressure, and so on, of the wick. Heat pipes generally have a thermal conductivity superior to copper's thermal conductivity of 400 W/m•K and are durable enough to be used for more than 15 years [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The principle of heat pipes was established by Grover in 1964 [5,6], and various forms of heat pipes have been developed with very high heat transfer performance. An annular heat pipe with distilled water as a working fluid showed a 1.85-fold improvement in heat transfer performance, compared to conventional heat pipes, in the experimental results of Faghri and Thomas [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Thermal and Flow Simulation of Concentric Annular Heat Pipe with Symmetric or Asymmetric Condenser

2021

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The current research work describes the flow and thermal analysis inside the circular flow region of an annular heat pipe with a working fluid, using computational fluid dynamics (CFD) simulation. A two-phase flow involving simultaneous evaporation and condensation phenomena in a concentric annular heat pipe (CAHP) is modeled. To simulate the interaction between these phases, the volume of fluid (VOF) technique is used. The temperature profile predicted using computational fluid dynamics (CFD) in the CAHP was compared with previously obtained experimental results. Two-dimensional and three-dimensional simulations were carried out, in order to verify the usefulness of 3D modeling. Our goal was to compute the flow characteristics, temperature distribution, and velocity field inside the CAHP. Depending on the shape of the annular heat pipe, the thermal performance can be improved through the optimal design of components, such as the inner width of the annular heat pipe, the location of the condensation part, and the amount of working fluid. To evaluate the thermal performance of a CAHP, a numerical simulation of a 50 mm long stainless steel CAHP (1.1 and 1.3 in diameter ratio and fixed inner tube diameter (78 mm)) was done, which was identical to the experimental system. In the simulated analysis results, similar results to the experiment were obtained, and it was confirmed that the heat dissipation was higher than that of the existing conventional heat pipe, where the heat transfer performance was improved when the asymmetric area was cooled. Moreover, the simulation results were validated using the experimental results. The 3-D simulation shows good agreement with the experimental results to a reasonable degree.

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Section: Introductionmentioning

confidence: 97%