Researches on the Influence of Chemical Composition Regarding the Physical-Mechanical Characteristics of Steel for the Manufacture of Monobloc Wheels

Andronache, C.; Socalici, Ana; Vîlceanu, Lucia; Hepuţ, Teodor

doi:10.4028/www.scientific.net/ssp.188.352

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“…Today more than ever, controlled heat transfer plays an important role in the development of energy-efficient heat transfer systems and fluids which are required in many industries and commercial applications [1][2][3][4]. Natural convection (i.e.…”

Section: Introductionmentioning

confidence: 99%

Buoyancy-Induced Flow and Heat Transfer of Power Law Fluids in a Side Heated Square Cavity

Ternik¹,

Buchmeister²

2015

Int. j. simul. model.

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This paper details the numerical study of laminar natural convection in a square enclosure filled with a non-Newtonian fluid. Thermal boundary conditions of the Dirichlet type are applied on the vertical walls of the enclosure while the horizontal ones are assumed adiabatic. A Power-law model is used to characterize the viscous behaviour of the purely viscous non-Newtonian fluids. The governing differential equations have been solved by the standard finite volume method and the hydrodynamic and thermal fields were coupled together using the Boussinesq approximation.The effects of Power-law index ( ) in the range 0.50 ≤ ≤ 1.50 on the heat and momentum transport are investigated for the values of Rayleigh number ( ) in the range 10 1 ≤ ≤ 10 4 and a Prandtl number of Pr = 10.We report accurate results of a systematic study with a focus on the most important buoyancyinduced flow and heat transfer characteristics. It is shown that the mean Nusselt number values increases with the increasing values of Rayleigh number for Newtonian as well as Power-law fluids. However, shear-thickening fluids (n > 1) are characterised with smaller ̅̅̅̅ values. Finally, the onset of convection dominated heat transfer mechanism is shifted towards lower values of for the shearthinning fluids (n < 1).

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Section: Introductionmentioning

confidence: 99%