Heat pipe research and development in the Americas

Dobran, Flavio

doi:10.1016/0890-4332(89)90140-3

Cited by 21 publications

(6 citation statements)

References 48 publications

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“…A recent book by Lock (1992) provides a thorough discussion on various types of thermosyphons. Dobran (1989) summarizes heat pipe research and applications. A comprehensive review on flooding and entrainment inside heat pipes and thermosyphons was provided by Peterson and Bage (1991).…”

Section: Thermodynamic Analysis Of Thermosyphonsmentioning

confidence: 99%

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Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

Sabharwal¹

2009

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Three hydrogen production processes, powered by a Next Generation Nuclear Plant (NGNP), are currently under investigation at Idaho National Laboratory. The first is high-temperature steam electrolysis, which uses both heat and electricity; the second is thermo-chemical production through the sulfur iodine process primarily using heat; the third is a hybrid sulfur process (not part of this study) which incorporates sulfur acid decomposition and sulfur dioxide depolarized electrolysis, all processes require a high temperature (>850°C) for enhanced efficiency; temperatures indicative of the NGNP. Safety and licensing mandates prudently dictate that the NGNP and the hydrogen production facility be physically isolated, perhaps requiring separation of over 100 m. This research presents useful insights into making decisions regarding the thermosyphon heat transfer system between the nuclear reactor and chemical plant. Developing very high-temperature reactor technologies for producing electricity, hydrogen, and other energy products is a high priority for a successful national energy future.

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Section: Thermodynamic Analysis Of Thermosyphonsmentioning

confidence: 99%

“…The first model considering the thermosyphon as an integrated system was provided by Shiraishi et al in 1981. Dobran (1989 developed a system model based upon conservation of mass, momentum, and energy and including thermal hydraulics of the vapor core, liquid film, and the liquid pool.…”

Section: Thermodynamic Analysis Of Thermosyphonsmentioning

confidence: 99%

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

Sabharwal¹

2009

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“…With developments in devices, the heat pipe is used in many engineering fields nowadays. Due to the heat transport by evaporation and condensation of the fluid researchers, a heat pipe is effective by a simple device, which has a very high thermal conductance [1][2][3]. The heat pipe can be divided into three sections: the evaporator which is located near the heat source, the condenser which is located near the heat sink and the middle portion called the adiabatic section [3].…”

Section: Introductionmentioning

confidence: 99%

CFD Heat Pipe Simulation of Mass Transfer in NH₃-Water Nanofluid Flow

2018

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In the present study, the enhancement of heat pipe efficiency with nanoparticles mixtures, using Adina AUI software (version 9.0.0) was studied. The effect of the fluid in water and NH3 concentration on the convective mass transfer coefficient were studied. The study showed that the heat transfer coefficient enhanced by increasing the nanoparticle concentration. According to this research, the CFD is able to simulate mass transfer in a pipe with a nanofluid.

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“…Moreover, the liquid viscous pressure drop is minimal because the liquid flows through a channel with a much larger cross-sectional area compared with that of traditional groove geometries. The circumferential grooves in the vapor channel not only provide an effective liquid distribution but also maximize the heat transfer area for the evaporation of liquid in the evaporator section [3,5,[12][13][14][15][16][17][18]. At present, among all the groove geometries, heat pipe with axial monogroove has the largest heat transport capability with high heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…Capillary forces developed in the capillary structure circulate the working fluid back to the high temperature regions so that no external power is required [1,2]. Since the first use of the term "heat pipe" by Grover and his colleagues at Los Alamos National Laboratories in 1964 and the publication of their initial results that reported on an independent investigation, heat pipes have attracted the interest of researchers and engineers worldwide, and big progress has been made in the structural improvement, mathematical modeling and engineering applications of these devices [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Evaporative Heat Transfer Analysis of a Heat Pipe With Hybrid Axial Groove

Bai¹,

Lin

Peterson

2013

Journal of Heat Transfer

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Through the application of thin film evaporation theory and the fundamental operating principles of heat pipes, a hybrid axial groove has been developed that can greatly enhance the performance characteristics of conventional heat pipes. This hybrid axial groove is composed of a V-shaped channel connected with a circular channel through a very narrow longitudinal slot. During the operation, the V-shaped channel can provide high capillary pressure to drive the fluid flow and still maintain a large evaporative heat transfer coefficient. The large circular channel serves as the main path for the condensate return from the condenser to the evaporator and results in a very low flow resistance. The combination of a high evaporative heat transfer coefficient and a low flow resistance results in considerable enhancement in the heat transport capability of conventional heat pipes. In the present work, a detailed mathematical model for the evaporative heat transfer of a single groove has been established based on the conservation principles for mass, momentum and energy, and the modeling results quantitatively verify that this particular configuration has an enhanced evaporative heat transfer performance compared with that of conventional rectangular groove, due to the considerable reduction in the liquid film thickness and a corresponding increase in the evaporative heat transfer area in both the evaporating liquid film region and the meniscus region.

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Heat pipe research and development in the Americas

Cited by 21 publications

References 48 publications

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

CFD Heat Pipe Simulation of Mass Transfer in NH₃-Water Nanofluid Flow

Evaporative Heat Transfer Analysis of a Heat Pipe With Hybrid Axial Groove

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Heat pipe research and development in the Americas

Cited by 21 publications

References 48 publications

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

CFD Heat Pipe Simulation of Mass Transfer in NH3-Water Nanofluid Flow

Evaporative Heat Transfer Analysis of a Heat Pipe With Hybrid Axial Groove

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CFD Heat Pipe Simulation of Mass Transfer in NH₃-Water Nanofluid Flow