Experimental study of radiation absorption by microchannels of varying aspect ratios

Horvath, Julie A.; Webb, Rebecca N.

doi:10.1016/j.solener.2011.02.021

Cited by 4 publications

(7 citation statements)

References 7 publications

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“…where eqs. from (20) to (23) are the boundary conditions. Also, the skin friction drag coefficient and the Nusselt number are expressed as:…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 99%

“…The radiative heat transfer is common. Recently, the use of microchannel in solar collector has been increasing because the miniaturized devices produce higher performance [19][20][21]. Even though many researchers have performed the steady-state analysis of solar collector considering combined heat transfer of conduction, THERMAL SCIENCE: Year 2016, Vol.…”

Section: Introductionmentioning

confidence: 99%

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Thermal radiation effects on the onset of unsteadiness of fluid flow in vertical microchannel filled with highly absorbing medium

2016

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This study presents the effect of thermal radiation on the steady flow in a vertical micro channel filled with highly absorbing medium. The governing equations (mass, momentum, and energy equation with Rosseland approximation and slip boundary condition) are solved analytically. The effects of thermal radiation parameter, the temperature parameter, Reynolds number, Grashof number, velocity slip length, and temperature jump on the velocity and temperature profiles, Nusselt number, and skin friction coefficient are investigated. Results show that the skin friction and the Nusselt number are increased with increase in Grashof number, velocity slip, and pressure gradient while temperature jump and Reynolds number have an adverse effect on them. Furthermore, a criterion for the flow unsteadiness based on the temperature parameter, thermal radiation parameter, and the temperature jump is presented.

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“…where eqs. from (20) to (23) are the boundary conditions. Also, the skin friction drag coefficient and the Nusselt number are expressed as:…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal radiation effects on the onset of unsteadiness of fluid flow in vertical microchannel filled with highly absorbing medium

2016

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“…The system in Figure 1 is found in various solar energy applications such as the solar collectors 28 and thermo-syphon solar water heaters. 29 Therefore, the observations in this study are expected to be a key knowledge in designing the miniaturized solar energy absorbers, because all the non-dimensionalized parameters here are the major design parameters for that purpose.…”

Section: Also Inmentioning

confidence: 99%

Numerical analysis of natural convection of magnetohydrodynamic flow in vertical micro-channel with rarefaction effects and radiative heat transfer

Jamalabadi

Kim

Lee

et al. 2016

Advances in Mechanical Engineering

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In this article, we present a comprehensive analysis of the flow and heat transfer characteristics of a fully developed incompressible, electrically conducting, and radiatively active fluid flow in micro-channel in the presence of transverse magnetic field. The Navier-Stokes and energy governing equations for magnetohydrodynamic flow, including thermal radiation and rarefaction effects, are considered to examine the wall properties (friction and heat transfer) and the flow properties (temperature and velocity). Two rarefaction effects of velocity slip and temperature jump at the wall are modeled as the product of characteristic slip/jump length and the first derivatives of velocity and temperature, respectively. Since the natural convection of magnetohydrodynamic flow in channel is resulted from the competition between deriving forces by pressure gradient, temperature gradient, and magnetic field, its flow and heat transfer characteristics should be understood systematically. First, we obtain the system parameters representing thermal radiation, buoyancy, magnetic field, temperature difference, velocity slip length, and temperature jump length through the non-dimensionalization process, and then their influences are rigorously evaluated by solving the governing equations numerically using RungeKutta algorithm with shooting method.

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“…When fluid flow is confined by small systems such as micro/nanochannels, some discontinuity in velocity and temperature profiles might happen at the interface of the fluid and solid surface [28][29][30]. Ulmanella and Ho [28] experimentally observed the velocity for various micro-sized channels, which is a function of shear rate, type of liquid and surface morphology.…”

Section: Introductionmentioning

confidence: 99%

“…One of the potential applications of current research is the design of collectors for thermal storage [30], such as in thermo-syphon solar water heaters [31]. As shown in Figure 1, a vertical channel acting as a collector of the thermal energy contains a moving phase change material heated by the solar radiation.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Magnetohydrodynamic Mixed Convection Flow in a Vertical Channel with Slip Boundary Conditions and Thermal Radiation Effects by Using an Entropy Generation Minimization Method

Jamalabadi

Park

Lee

2015

Entropy

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Abstract:Investigation of the effect of thermal radiation on a fully developed magnetohydrodynamic (MHD) convective flow of a Newtonian, incompressible and electrically conducting fluid in a vertical microchannel bounded by two infinite vertical parallel plates with constant temperature walls through a lateral magnetic field of uniform strength is presented. The Rosseland model for the conduction radiation heat transfer in an absorbing medium and two plates with slip-flow and no-slip conditions are assumed. In addition, the induced magnetic field is neglected due to the assumption of a small magnetic Reynolds number. The non-dimensional governing equations are solved numerically using Runge-Kutta-Fehlberg method with a shooting technique. The channel is optimized based on the Second Law of Thermodynamics by changing various parameters such as the thermal radiation parameter, the temperature parameter, Hartmann number, Grashof to Reynolds ratio, velocity slip length, and temperature jump.

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Experimental study of radiation absorption by microchannels of varying aspect ratios

Cited by 4 publications

References 7 publications

Thermal radiation effects on the onset of unsteadiness of fluid flow in vertical microchannel filled with highly absorbing medium

Thermal radiation effects on the onset of unsteadiness of fluid flow in vertical microchannel filled with highly absorbing medium

Numerical analysis of natural convection of magnetohydrodynamic flow in vertical micro-channel with rarefaction effects and radiative heat transfer

Optimal Design of Magnetohydrodynamic Mixed Convection Flow in a Vertical Channel with Slip Boundary Conditions and Thermal Radiation Effects by Using an Entropy Generation Minimization Method

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