Laminar Forced Convection Heat Transfer Characteristics from a Heated Cylinder in Water Based Nanofluids

Ternik, Primož; Rudolf, Rebeka

doi:10.2507/ijsimm13(3)5.271

Cited by 10 publications

(4 citation statements)

References 19 publications

(23 reference statements)

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“…With each grid refinement the number of elements in particular direction is increased and element size is reduced. Such a procedure is useful (and encountered in many numerical studies [24,25]) for obtaining a higher-order estimate of the flow value (value at infinite grid) from a series of lower-order discrete values [26].…”

Section: Grid Refinement and Numerical Accuracy Studymentioning

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: Grid Refinement and Numerical Accuracy Studymentioning

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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“…is important during many engineering applications ranging from the cooling of electronics to building aerodynamics. Although free-flow around the circular cylinders has been the focus of extensive research [7], less effort has been put into researching the confined flow around bluff bodies, especially around the square cylinders. Additional parameters need to be defined for the confined flow, namely those inflow velocity profiles and blockage ratios of the channel that do not appear in free-flow cases.…”

Section: Bem-based Algorithm For Urans Simulations Of Flow Over a Squmentioning

confidence: 99%

BEM-Based Algorithm for URANS Simulations of Flow over a Square Cylinder

Lupše

Škerget

Ravnik

2015

SV-JME

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The boundary element method (BEM) is extended for the discretisation of the incompressible Navier-Stokes equations in the velocity-vorticity form for the URANS formulation. BEM uses fundamental solutions as weighting functions, thus the approach enables inclusions of some of the governing physics in the method itself. For testing purposes the flow around the square cylinder in the two-dimensional channel with a blockage ratio of 1/8 was chosen as the appropriate test case. The flow was calculated for the Reynolds numbers ranging from 100 to 1000. At Reynolds number 1000, the governing equations were solved directly in a quasi DNS manner and in the RANS form using the Spalart-Allmaras turbulence model within an URANS simulation.

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“…With each grid refinement the number of elements in a particular direction is increased and element size is reduced. Such a procedure is useful (and encountered in many numerical studies [21][22][23]) for obtaining a higher-order estimate of the flow value (value at infinite grid) from a series of lower-order discrete values [24].…”

Section: Grid Refinement and Numerical Accuracy Studymentioning

confidence: 99%

Numerical Analysis of Continuous Casting of NiTi Shape Memory Alloy

Ternik¹,

Rudolf²

2016

Int. j. simul. model.

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The present study deals with the numerical analysis of the solidification process of NiTi binary alloy in a lab-scale continuous casting device. The physical medium is taken as an incompressible fluid where the heat is transferred by conduction and convection, including the thermal phase change phenomenon. The energy equation which includes both convection-diffusion heat transfer and a mushy region for the phase-change (solidification) is modelled by using an enthalpy-based formulation. The numerical approach is based on the finite volume method in body fitted coordinates with a SIMPLE scheme to couple the pressure and velocity fields.Results show that the casting speed has a significant effect on the temperature distribution and, consequently on the solidification as well as metallurgical length. High casting speed may cause inadequate thickness of the solidified material at the mould exit to withstand the hydrostatic pressure of the molten NiTi below the mould and may also lead to breakout due to sticking of the solidified shell and mould because of lack of slag film for lubrication between the two.

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Laminar Forced Convection Heat Transfer Characteristics from a Heated Cylinder in Water Based Nanofluids

Cited by 10 publications

References 19 publications

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

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

BEM-Based Algorithm for URANS Simulations of Flow over a Square Cylinder

Numerical Analysis of Continuous Casting of NiTi Shape Memory Alloy

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