Results 211 to 220 of about 25,109 (264)
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1997
This chapter introduces the notion of natural convection. In natural convection, the fluid velocity arises purely from the heating or cooling of the heat transfer surface itself. Heating creates less dense fluid next to the surface which tends to rise under buoyancy. Furthermore, the low velocities (compared to forced convection) give low heat transfer
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This chapter introduces the notion of natural convection. In natural convection, the fluid velocity arises purely from the heating or cooling of the heat transfer surface itself. Heating creates less dense fluid next to the surface which tends to rise under buoyancy. Furthermore, the low velocities (compared to forced convection) give low heat transfer
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Stability of Transient Natural Convection
The Physics of Fluids, 1969A theoretical analysis was carried out to determine the stability properties of unsteady natural convection. In this analysis a perturbation technique was used in conjunction with a special type unsteady base flow for transient natural convection between two infinite parallel vertical plates.
Gunness, Robert C. jun. +1 more
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Natural Convection Driven by Osmosis
SIAM Journal on Applied Mathematics, 1982A semi-permeable membrane forms part of a vertical plane boundary which separates pure solvent from a solution of bulk concentration $C_b $. The osmotic flux J is given by $J = P\Delta C$ where P is the osmotic permeability of the membrane and $\Delta C$ is the concentration difference across it, less than $C_b $ because the osmotic flow tends to sweep
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EXPERIMENTAL TECHNIQUES IN NATURAL CONVECTION
Experimental Thermal and Fluid Science, 1993Experimental techniques in natural convection heat transfer employed in the author's laboratory are introduced. The techniques are mostly related to visualization of flow, temperature field, and heat flux distribution in fluids. Three topics are presented, the first being natural convection in a horizontal rectangular liquid layer driven by surface ...
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Microscales of Natural Convection
Heat Transfer: Volume 3, 1997Abstract A universal dimensionless number, ΠN∼NN1+Pr-1 ,Pr being the usual Prandtl number and NN the limit of ΠN for Pr → ∞, is introduced for all natural convection processes. For NN=Ra ,Ra being the usual Rayleigh number, ΠN describes buoyancy-driven natural convection.
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2015
As opposed to a forced convection flow where external means are used to provide the flow, the free-convection flow field is a self-sustained flow driven by the presence of a temperature gradient.
Bahman Zohuri, Nima Fathi
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As opposed to a forced convection flow where external means are used to provide the flow, the free-convection flow field is a self-sustained flow driven by the presence of a temperature gradient.
Bahman Zohuri, Nima Fathi
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Modeling of natural convection
2016 2nd International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM), 2016Numerical simulation with ANSYS Fluent, Code Saturne and OpenFOAM is compared in terms of the problem of natural convection in enclosed volume of air in the presence of a heating element. A comparative analysis of software on the basis of three turbulence models (k-e, SST and WALE) is conducted. The results adequacy is assessed.
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Natural Convection Film Boiling
2007If the wall temperature at film boiling is larger then the Leidenfrost or the socalled minimum film boiling temperature an unstable heat-transfer regime is observed, being partially film boiling and partially nucleate boiling called transition boiling.
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