The Impact of Reduced Gravity on Free Convective Heat Transfer from a Finite, Flat, Vertical Plate

Lotto, Michael; Johnson, K.M.; Nie, Christopher W.; Klaus, David M.

doi:10.1007/s12217-017-9555-8

Cited by 15 publications

(3 citation statements)

References 9 publications

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“…[41][42][43] One of the major fluid flows in pool boiling heat transfer that changes dramatically from terrestrial gravity to a microgravity environment is thermal convective flow. [44][45][46][47][48] Thermal convective flow is produced by the temperature-gradient-induced density gradient in a fluid. The hotter fluid with lower density rises upward while the colder fluid moves downward, driven by the buoyancy force on Earth.…”

Section: Introductionmentioning

confidence: 99%

Bubble Nucleation and Growth on Microstructured Surfaces under Microgravity

Zhang

Jiya³

et al. 2023

Preprint

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Understanding the nucleation and growth dynamics of the surface bubbles generated on a heated surface can benefit a wide range of modern technologies, such as the cooling systems of electronics, refrigeration cycles, nuclear reactors and metal industries, etc. Usually, these studies are conducted in a terrestrial environment. As space exploration and economy expand at an unprecedented pace, the aforementioned applications that are potentially deployable in space call for the understanding of thermal bubble phenomena in a microgravity setting. In this work, we investigate the nucleation and growth of surface bubbles in space, where the gravity effect is negligible compared to Earth. We observe much faster bubble nucleation, and the growth rate can be ~30 times higher than that on Earth. Our finite element thermofluidic simulations show that the thermal convective flow due to gravity around the nucleation site is the key factor that effectively dissipates the heat from the heating substrate to the bulk liquid and slows down the bubble nucleation and growth processes. Due to the microgravity field in space, the thermal convective flow is negligible compared to the terrestrial environment, leading to heat localization around the nucleation site, thus enabling faster bubble nucleation and growth in space. We also find that bubble nucleation can be influenced by the characteristic length of the microstructures on heating surface. The microstructures behave as fins to enhance the cooling of the surface. With finer microstructures enabling more efficient surface-to-liquid heat transfer, the bubble nucleation takes longer.

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Section: Introductionmentioning

confidence: 99%

Bubble Nucleation and Growth on Microstructured Surfaces under Microgravity

Zhang

Jiya³

et al. 2023

Preprint

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“…Raju et al [13] looked at the mechanism of heat rate on an unstable convective Casson circular fuid problem on rotational vertical heated-cone immersed in porous material. Te efect of reduced gravity on free convective heat transfer from a fnite, fat, and vertical heated plate was numerically studied by Lotto et al [14]. Te efect of viscous dissipation on fuctuating momentum and transient thermal boundary layer free/force convective fow over a sphere was deduced in [15].…”

Section: Introductionmentioning

confidence: 99%

Reduced Gravity and Magnetohydrodynamic Effects on Transient Mixed Convection Flow Past a Magnetized Heated Cone Embedded in Porous Medium

Nabwey

Ullah

Ilyas

et al. 2023

Journal of Mathematics

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The effects of reduced gravity on the periodic behavior of convective heat transfer characteristics of fluid flow along the magnetized heated cone embedded in porous medium is studied in the current contribution. The mathematical form of the nonlinear partial differential equations subject to the boundary conditions for the proposed unsteady model is presented. By employing appropriate dimensionless quantities, the mathematical equations are transformed into dimensionless form to get the numerical solutions of the proposed model. The dimensionless form is further condensed to a form that is more straightforward for smooth numerical computations. Later, large simulations are run using the implicit finite difference method for appropriate range of parameters values included in the flow model. The effect of reduced gravity parameter R g , the Richardson parameter or mixed convection parameter λ , the Prandtl number Pr, and the porosity parameter Ω , on chief physical quantities, that is, velocity profile, temperature distribution, magnetic intensity, transient skin friction, transient rate of heat transfer, and transient current density are simulated and highlighted graphically. Additionally, via careful examination and intentional discussion of physical reasoning, the physical impacts of various factors on the material qualities are examined. Applications that motivate the present work is the reduced gravity effects due to which the other nongravity forces such as thermal volume expansion, density difference, and magnetic field can induce the fluid motion.

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“…Another application for this geometry is the control of the heat transfer by dielectrophoretic force. In particular, the heat transfer and its control under reduced gravity condition are in the focus of attention of researchers (Evgeridis et al 2011;Lotto et al 2017). Experiments have been performed under Earth's gravity conditions (Chandra and Smylie 1972), and many theoretical and numerical works have been done considering microgravity conditions in order to focus on the effects of the thermoelectric buoyancy (Takashima 1980;Malik et al 2012;Yoshikawa et al 2013;Travnikov et al 2015Travnikov et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

Flow Patterns and Heat Transfer in a Cylindrical Annulus under 1g and low-g Conditions: Theory and Simulation

Meyer

Crumeyrolle

Mutabazi

et al. 2018

Microgravity Sci. Technol.

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A dielectric fluid is confined in a stationary vertical cylindrical annulus. A temperature difference is applied between the two cylinders, as well as an alternating electric potential. This configuration creates an active force called dielectrophoretic force, which acts as a thermal buoyancy force. Different axial gravity intensities are considered, so that two thermal buoyancies will affect the flow: the thermoelectric buoyancy intervenes in the radial direction and the Archimedean buoyancy acts in the axial direction. Linear stability analysis and direct numerical simulation are performed following experimental research that has been performed during parabolic flight campaigns.

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The Impact of Reduced Gravity on Free Convective Heat Transfer from a Finite, Flat, Vertical Plate

Cited by 15 publications

References 9 publications

Bubble Nucleation and Growth on Microstructured Surfaces under Microgravity

Bubble Nucleation and Growth on Microstructured Surfaces under Microgravity

Reduced Gravity and Magnetohydrodynamic Effects on Transient Mixed Convection Flow Past a Magnetized Heated Cone Embedded in Porous Medium

Flow Patterns and Heat Transfer in a Cylindrical Annulus under 1g and low-g Conditions: Theory and Simulation

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