Numerical investigation of a thermosyphon MHD electrical power generator

Teimouri, Hamid; Behzadmehr, A.

doi:10.1016/j.enconman.2019.02.085

Cited by 11 publications

(8 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermosyphon systems are used in solar hot water units and are also considered for efficient next-generation superconducting machine designs which have cooling loads in excess of the MW range (Yamaguchi et al 2019). Thermosyphon systems have also been proposed for electricity generation from low-temperature geothermal heat (Li and Liu 2011;Teimouri and Behzadmehr 2019;Eavor 2021). Thermosyphons could be used in PICTs to harvest heat from shallow geothermal reservoirs for either direct-use applications or power generation in small communities, thus being an important technology to enable access to heat and electricity.…”

Section: Thermosyphonsmentioning

confidence: 99%

Geothermal Energy for PICTs

Santagata,

Regenauer-Lieb,

Corkish

2024

Water Security in a New World

View full text Add to dashboard Cite

The following chapter explores the utilization of geothermal resources to provide energy, food, and water solutions in both urban and rural populations in the Pacific-several of which have vast geothermal reservoirs. A variety of geothermal-based technologies are presented providing alternative approaches to essential services such as electricity, food drying, refrigeration, and desalination. A set of design principles for geothermal solutions in the Pacific is also outlined and explored in further detail via a brief pre-feasibility case study for a geothermal village development on Tanna Island, Vanuatu. Finally, the opportunities of direct heat using underground geothermal implementations are discussed, indicating that these may well be an excellent means to provide low-cost solutions to rural areas, reduce investment risks associated with deeper geothermal well drills, and recycle waste heat to provide a wide range of services.

show abstract

Section: Thermosyphonsmentioning

confidence: 99%

Geothermal Energy for PICTs

Santagata,

Regenauer-Lieb,

Corkish

2024

Water Security in a New World

View full text Add to dashboard Cite

show abstract

“…In liquid metals, the Hall parameter is negligible and thus neglected. The dimensional equations and more details were recently presented by Teimouri and Behzadmehr (2019). The dimensionless, two-dimensional governing equations for the prescribed model of the thermosyphon are: where, the term – Ha 2 Pr V is the Lorentz force and the term Ec m Ha 2 Pr V 2 is Joule heating.…”

Section: Statement Of the Problem And Mathematical Modelmentioning

confidence: 99%

“…Based on their results, the magnetic field can postpone the onset of oscillations in the fluid flow. Recently, Teimouri and Behzadmehr (2019) introduced a conceptual design for generating electrical power using the liquid gallium MHD-thermosyphon. Based on their result, the generated electrical power augments with increasing the Rayleigh number in an optimum Hartmann number and aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

“…Liquid metals have great thermal conductivities, which can increase heat transfer (Yang and Liu, 2018). Due to their high electrical conductivity, Liquid metals are proper working fluids in MHD generators (Yamada et al , 2006; Niu et al , 2014; Teimouri and Behzadmehr, 2019). However, the low Prandtl numbers of the liquid metals may lead to oscillatory flow in natural convection problems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of magnetic field on the liquid gallium thermosyphon fluid flow; a numerical study

Teimouri

Behzadmehr

2019

HFF

View full text Add to dashboard Cite

Purpose This paper aims to numerically study the laminar natural convection in a thermosyphon filled with liquid gallium exposed to a constant magnetic field. The left wall of the thermosyphon is at an uniformed hot temperature, whereas the right wall is at a uniform cold temperature. The top and bottom walls are considered to be adiabatic. All walls are electrically insulated. The effects of Hartmann number, in a wide range of Rayleigh number and aspect ratio combinations, on the natural convection throughout the thermosyphon, are investigated and discussed. Furthermore, different forces that influence the natural flow structure are studied. Design/methodology/approach A Fortran code is developed based on the finite volume method to solve the two-dimensional unsteady governing equations. Findings Imposing a magnetic field improves the stability of the fluid flow and thus reduces the Nusselt number. For a given Hartmann and Rayleigh number, there is an optimum aspect ratio for which the average velocity becomes maximum. Research limitations/implications This paper is a two-dimensional investigation. Originality/value To the best of the authors’ knowledge, the effect of the magnetic field on natural convection of liquid gallium in the considered thermosyphon has not been studied numerically in detail. The results of this paper would be helpful in considering the application of the low Prandtl number’s liquid metals in thermosyphon MHD generators and certain cooling devices.

show abstract

“…The magnetic field can constrain the motion of the plasma in the gun [17]- [20], and then affect the internal ballistic characteristics of the gun by affecting the airflow in the gun chamber. Magnetic confined plasma technology is relatively mature and has applications in many aspects, such as magnetohydrodynamic (MHD) power generation [21]- [23], nuclear fusion [18], [24], [25], laser plasma source [26]- [28], and astrophysics [19], [20], [29]. Nonetheless, few people in and out of the country have applied magnetically confined plasma to improve the muzzle velocity of guns.…”

Section: Introductionmentioning

confidence: 99%

Influence of Magnetically Confined Plasma on the Muzzle Velocity of Gun Projectile

Wang

Pei

et al. 2020

IEEE Access

View full text Add to dashboard Cite

Under the influence of gun barrel design, materials, and propellant, improving pirojectile muzzle velocity is the bottleneck in gun development. An innovative method based on magnetically confined plasma theory was therefore proposed to improve the projectile muzzle velocity. Compared with the traditional methods for increasing the projectile muzzle velocity, the method proposed in this study has a simpler design structure, a broad applicability to different caliber guns with lower cost, and an obvious effect on improving muzzle velocity. The core idea was to use the magnetic field to constrain the plasma generated by gunpowder combustion ionization in the gun bore to increase the projectile bottom pressure, thereby increasing the projectile muzzle velocity. First, the mechanism of increasing the projectile muzzle velocity by magnetically confined plasma in the gun barrel was analyzed. Second, a new gunpowder gas thermal ionization model was established based on interior ballistic and plasma theories. The fourth-order Runge-Kutta algorithm was used to numerically simulate the changes in plasma density and conductivity during the combustion ionization of gunpowder. The effects of different ionized seed contents and propellant forces on the density and conductivity of plasma were numerically simulated to improve the ionization efficiency of gunpowder. Adding ionized seeds or propellant force improves the ionization efficiency of gunpowder, increases the binding force of the magnetic field on plasma, and enhances the projectile muzzle velocity. Finally, shooting tests were performed with a test barrel. Experimental results verified the correctness of the theoretical analysis and numerical simulation.INDEX TERMS Magnetically confined plasma, projectile muzzle velocity, projectile bottom pressure, thermal ionization model.

show abstract

Numerical investigation of a thermosyphon MHD electrical power generator

Cited by 11 publications

References 45 publications

Geothermal Energy for PICTs

Geothermal Energy for PICTs

Effects of magnetic field on the liquid gallium thermosyphon fluid flow; a numerical study

Influence of Magnetically Confined Plasma on the Muzzle Velocity of Gun Projectile

Contact Info

Product

Resources

About