Solutions for MHD Natural Convection Flow of a Particulate Suspension Through a Vertical Channel With Asymmetric Thermal Boundary Conditions

Chamkha, Ali J.; Al-Rashidi, Seham S.

doi:10.1615/heattransres.2012005634

Cited by 3 publications

(1 citation statement)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Al-Subaie and Chamkha (2003) have addressed the natural convection of particulate suspensions in a parallel plate channel. Various effect of heat transfer in a channel have been investigated in literature including the effect of channel boundary conditions (Chamkha, 2003; Chamkha and Al-Rashidi, 2010), developed flow (Chamkha et al , 2003; Kumar et al , 2010), magnetic field effects (Umavathi et al , 2008; Chamkha and Al-Rashidi, 2013), radiation effects (Ahmed and Chamkha, 2014), conjugate heat transfer in thick walls (Umavathi et al , 2016) and variable thermophysical properties (Rahman et al , 2014).…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic field analysis and cooling system design for high power switched reluctance motor

Yan

Teng

et al. 2019

HFF

View full text Add to dashboard Cite

Purpose The electromagnetic field and cooling system of a high power switched reluctance motor (SRM) are studied numerically. The geometry of the motor and its main components are established using a computer-aided design software in the actual size. This study aims to evaluate the resulting thermal losses using the electromagnetic analysis of the motor. Design/methodology/approach In the electromagnetic analysis, the Joule’s loss in the copper wires of the coil windings and the iron losses (the eddy currents loss and the hysteresis loss) are considered. The flow and heat transfer model for the thermal analysis of the motor including the conduction in solid parts and convection in the fluid part is introduced. The magnetic losses are imported into the thermal analysis model in the form of internal heat generation in motor components. Several cooling system approaches were introduced, such as natural convection cooling, natural convection cooling with various types of fins over the motor casing, forced conviction air-cooled cooling system using a mounted fan, casing surface with and without heat sinks, liquid-cooled cooling system using the water in a channel shell and a hybrid air-cooled and liquid-cooled cooling system. Findings The results of the electromagnetics analysis show that the low rotational speed of the motor induces higher currents in coil windings, which in turn, it causes higher copper losses in SRM coil windings. For higher rotational speed of SRM, the core loss is higher than the copper loss is in SRM due to the higher frequency. An air-cooled cooling system is used for cooling of SRM. The results reveal when the rotational speed is at 4,000 rpm, the coil loss would be at the maximum value. Therefore, the coil temperature is about 197.9°C, which is higher than the tolerated standard temperature insulation material. Hence, the air-cooled system cannot reduce the temperature to the safe temperature limitation of the motor and guarantee the safe operation of SRM. Thus, a hybrid system of both air-cooled and liquid-cooled cooling system with mounting fins at the outer surface of the casing is proposed. The hybrid system with the liquid flow of Re = 1,500 provides a cooling power capable of safe operation of the motor at 117.2°C, which is adequate for standard insulation material grade E. Originality/value The electromagnetic field and cooling system of a high power SRM in the presence of a mounted fan at the rear of the motor are analyzed. The thermal analysis is performed for both of the air-cooled and liquid-cooled cooling systems to meet the cooling demands of the motor for the first time.

show abstract

Section: Introductionmentioning

confidence: 99%

Electromagnetic field analysis and cooling system design for high power switched reluctance motor

Yan

Teng

et al. 2019

HFF

View full text Add to dashboard Cite

show abstract

Numerical simulation of nanofluids for improved cooling efficiency in a 3D copper microchannel heat sink (MCHS)

Snoussi

Ouerfelli

Sharma

et al. 2017

Physics and Chemistry of Liquids

View full text Add to dashboard Cite

Hall and ion-slip effects on MHD free convective flow of a viscoelastic fluid through porous regime in an inclined channel with moving magnetic field

Singh¹,

Vishwanath²

2020

Kragujevac J Science

View full text Add to dashboard Cite

This paper consists of a mathematical analysis of MHD free convective flow of viscoelastic fluid through a porous regime in an inclined channel. The flow system is permeated by a uniform moving magnetic field with strong magnetic intensity to produce Hall and ion-slip effects. The flow governing equations are obtained from the suitable field and constitutive equations and solved analytically. To accentuate the consequences of various flow controlling parameters to the nature of the flow, numerical results are discussed in assistance with graphs and tables. An important fact noted from the study that Hall current generates the flow in the direction perpendicular to the main flow while ion-slip current reduces the flow in the direction perpendicular to the main flow. It is also seen that the moving magnetic field produces less rigidity in the flow in comparison to the stationary magnetic field.

show abstract

Solutions for MHD Natural Convection Flow of a Particulate Suspension Through a Vertical Channel With Asymmetric Thermal Boundary Conditions

Cited by 3 publications

References 21 publications

Electromagnetic field analysis and cooling system design for high power switched reluctance motor

Electromagnetic field analysis and cooling system design for high power switched reluctance motor

Numerical simulation of nanofluids for improved cooling efficiency in a 3D copper microchannel heat sink (MCHS)

Hall and ion-slip effects on MHD free convective flow of a viscoelastic fluid through porous regime in an inclined channel with moving magnetic field

Contact Info

Product

Resources

About