Electromagnetohydrodynamic Effects on Steam Bubble Formation in Vertical Heated Upward Flow

Mirzaee, Mojtaba; Hooshmand, Payam; Ahmadi, Hamed; Balotaki, Hassan Kavoosi; Khakrah, Hamidreza; Jamalabadi, Mohammad Yaghoub Abdollahzadeh

doi:10.3390/en9080657

Cited by 5 publications

(4 citation statements)

References 41 publications

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“…The influences of various parameters (such as the viscosity ratio, phase angle, Hall parameter, thermal conductivity ratio, and Prandtl number) on the velocity field, temperature field, shell friction, and Nusselt number were expressed. Mirzaee et al [44] investigated the effects of electromagnetohydrodynamics (EMHD) on the shape of a vapor bubble in upward heated vertical flow. It was observed that the Lorentz force could decrease and delay bubble production.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

et al. 2019

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Subcooled flow boiling is one of the major issues in the nuclear and power generation industries. If the fluid inlet temperature in the boiling area is less than the boiling temperature, the boiling process is called subcooled boiling. The symmetry of a physical system is a constant property of the system and is fixed by deformation. Using magnetohydrodynamic (MHD) forces and broken symmetry induced by nanosized particles, fluid and thermal systems can be more controlled. In this study, the effect of a magnetic field and nanoparticles on subcooled flow boiling in a vertical tube was investigated. For this purpose, a one-dimensional numerical code was used to simulate the flow and variations of various parameters that have been investigated and evaluated. The results showed that as the flow entered the heated area, the vapor volume fraction, Froude number, fluid cross-sectional area forces, mixture velocity, fluid velocity, bubble departure diameter, liquid and vapor Reynolds numbers, squared ratio of the Froude number to the Weber number, and fluid cross-sectional area forces coefficient increased. In the same region, the Eötvös number, root mean square (RMS) of the fluid cross-sectional area force, sound velocity, liquid superficial velocity, critical tube diameter, bubble departure frequency, and density of the active nucleation site were reduced. It was also observed that after the heated area and under the influence of the magnetic field and the nanoparticles, the values of the vapor volume fraction, Froude number, fluid cross-sectional area force, mixture velocity, fluid velocity, vapor, liquid Reynolds number, and squared ratio of the Froude number to the Weber number were decreased. Moreover, there was no significant effect on the Eötvös number, liquid superficial velocity, Taylor bubble Sauter mean diameter, bubble departure diameter, critical tube diameter, bubble departure frequency, or density of the active nucleation site.

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Section: Introductionmentioning

confidence: 99%

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

et al. 2019

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“…The force balance conditions of the two-liquid model for any stage (i refers to fluid or vapor) in Table 3 can be found in Collier and Thome [3]. Here, the inertial force term in the interfacial momentum exchange model has been combined into single expressions to avoid the use of regime maps [16][17][18]. The Lorentz term considers powers other than weight and trituration powers, for example, magneto-hydrodynamic power.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Recently, Jamalabadi [16][17][18] worked on the EMHD effects on a straight up flow in annular pipe in a two-phase flow regime. However, the effect of MHD and nanoparticles on subcooled vertical pipe flow has not been calculated yet.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic and Nanoparticle Effects in Vertical Annular Subcooled Flow Boiling

Jamalabadi

2019

Symmetry

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The control of heated fluid is of interest in many fields of engineering, such as boiler and heat exchanger design. The broken symmetry of a thermo-physical system within a multi-sized media could be used to control its physical characteristics. In the current study, the effects of magnetohydrodynamic (MHD) forces and nanoparticles on boiling in a subcooled region inside an upright annular pipe have been investigated. The effect of magneto hydrodynamics on the base fluid (liquid water) was measured, and different nanoparticle concentrations were employed as the working fluids. The magnetic field perpendicular to fluid flow is used to control the liquid water and vapor water phase motion. The governing equation of motion and conservation of energy in both phases is solved with the aid of correlation for vaporization and condensation of nucleate boiling on the wall. The results of the mathematical simulation are in suitable agreement with the results of previous experiments. As associated with pure water, the results with dilute Nanofluids presented that the application of nanoparticles homogenized the temperature difference through the fluid and vapor phase. The results show that the MHD controller is a powerful method to decrease the amplitude of the vaporization and resulted in oscillations.

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“…One of the institutions in the world where low-speed penetrator technologies are being developed is the Space Research Center (CBK) of the Polish Academy of Sciences. Examples of penetrators with a battery in the form of a capacitor are MUPUS [6] and CHOMIK [7]-a penetrator developed for the Phobos Grunt mission. The driving unit of both penetrators is an electromagnet with a movable dive (hammer), shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Simulations and Tests of a KRET Aerospace Penetrator

et al. 2020

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This manuscript presents the simulation tests of an aerospace penetrator conducted to check the device’s validity and functionality. For this work, the numerical model was created on the basis of engineering data, the laboratory model of the tube reluctance actuator was created on the basis of the numerical model, and a set of simulations were executed on the basis of both presented. Moreover, the mathematical model was supplemented by precise boundary conditions. The main goal was the analysis of the introduced device’s properties by comparing them to experimental values. Three different variants were taken into account to check the construction functionality and to study the most important parameters, e.g., the hammer displacement, hammer velocity, eddy currents and overall electromagnetic properties of the penetrator’s hammer displacement. The high-end values of the applied components were derived on the basis of the results and are presented in the summary of the concluded work. An overall method for checking the validity of the penetrator was proposed, which is cost and time effective. The model used was not limited in the representation of physical phenomena.

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Electromagnetohydrodynamic Effects on Steam Bubble Formation in Vertical Heated Upward Flow

Cited by 5 publications

References 41 publications

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

Modeling of Subcooled Flow Boiling with Nanoparticles under the Influence of a Magnetic Field

Magnetohydrodynamic and Nanoparticle Effects in Vertical Annular Subcooled Flow Boiling

Simulations and Tests of a KRET Aerospace Penetrator

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