Effect of heat source aspect ratio on turbulent thermal stratification in a naturally ventilated enclosure

Harish, R.

doi:10.1016/j.buildenv.2018.07.043

Cited by 29 publications

(7 citation statements)

References 40 publications

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“…Subudhi et al, 16 ; Morsli et al, 17,18 ; Harish 19 ) and can be found, in general, in every technological situation in which a heat exchanger is required. Given the diversity and rich spectrum of circumstances in which multiple buoyant plumes interacting with a cross flow can be encountered in nature and the myriad technological applications briefly reviewed above, generalizations are rather difficult.…”

Section: Introductionmentioning

confidence: 98%

On the highly unsteady dynamics of multiple thermal buoyant jets in cross flows

Lappa

2019

Physics of Fluids

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Thermal plumes of small scale generated by spatially separated heat sources can form, like atoms in a chemical compound, complex structures of different kind and with distinct behaviors. The situation becomes even more complex if plumes can interact with imposed vertical shear (a horizontal wind). In this analysis a 'minimal framework' based on the application of a filtering process to the governing balance equations for mass, momentum and energy (falling under the general heading of 'Large Eddy Simulation' approach), is used together with Direct Numerical Simulation to inquiry about the relative importance of buoyancy and vertical shear effects in determining the patterning scenario when highly unsteady dynamics are established (turbulent flow). Emerging patterns range from the flow dominated by a static rising jet produced by the aggregation of plumes, which are pushed by horizontal leftwards and rightwards winds towards the center of the physical domain, to convective systems with disconnected thermal pillars of smaller scale, which travel in the same direction of the prevailing wind. The classical sheltering effect, which for flows that are steady 'in mean' simply consists of an increased deflection of the leading buoyant jet with respect to the trailing ones, is taken over by a variety of new phenomena, including (but not limited to) fast plume removal-rebirth mechanisms (with local increase in the velocity frequency and shrinkage in the related amplitude), 'bubble' formation-rupture and local departure of the frequency spectrum from the Kolmogorov similarity law.

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Section: Introductionmentioning

confidence: 98%

On the highly unsteady dynamics of multiple thermal buoyant jets in cross flows

Lappa

2019

Physics of Fluids

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“…The Reynolds averaged Naiver-stokes (RANS) for getting the time average energy equation and temperature field. The k-e turbulence model is used for obtaining turbulence [8][9][10][11][12][13]. For the energy that includes surface and surface radiation, then the governing equation as to solve:…”

Section: Modeling and Numerical Methodsmentioning

confidence: 99%

Turbulent Flow Behavior of Mixing Process Inside a Pharmaceutical Stirred Tank

Sharan¹,

Student²,

Bhuvaneshwar³

et al. 2020

IJEAT

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As mixing is an essential operation in many engineering fields a mixing system is designed using agitated vessels in which it is difficult to obtain accurate information on induced turbulence by the impeller where CFD can provide detailed understanding of such systems. Here the impeller is designed and tested in both single phase &multiphase. Here specifically incompressible flow is used and Multiple reference frame is used to model the motion of the impeller zone. Hence, we study the flow characteristics by comparing the velocity and temperature contour of three different rotating speed of the impeller and predict the percentage increase and decrease for varying boundary conditions.

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“…Subjected to the design speeds of the Hyperloop capsule, the flow is considered turbulent as the Reynold's number in the flow field is greater than 10 5 . To simulate the flow field, a k-epsilon Realizable turbulence model is employed [29][30][31]. ii.…”

Section: Basic Assumptionsmentioning

confidence: 99%

CFD Simulation on Aerodynamic Performance of Hyperloop Vehicle

Murty

Pabsetti

Bhoje

et al. 2023

ARFMTS

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Aerodynamic drag is one of the most opposing factors for ground vehicle. This becomes even more difficult while travelling through a tunnel. The Evacuated- Tube Trains (ETTs) or Hyperloop’s are a new concept of ground transportation presently being developed by many different companies. The main purpose of an Hyperloop can be displayed as a cheaper medium of ground transport, which could allow its consumers to propagate to different places at a cheaper and faster rate compared to the present day locomotives and road transport. Passengers can travel at over 700 mph in floating capsules that swoop along within gigantic low-pressure tubes that are either below or above surface. This study analyses the Hyperloop designs using Computational Fluid Dynamics software ANSYS FLUENT. The effects of operating speed, Capsule shape and internal tube pressure have been studied in this paper. The flow inside the tube is considered as turbulent and incompressible. The software simulation results show the significant effects of inside pressure and operating speed on the aerodynamic drag of the capsule. Study with different shapes for the Capsule’s front and rear end suggest the most optimum shape for least aerodynamic drag.

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Effect of heat source aspect ratio on turbulent thermal stratification in a naturally ventilated enclosure

Cited by 29 publications

References 40 publications

On the highly unsteady dynamics of multiple thermal buoyant jets in cross flows

On the highly unsteady dynamics of multiple thermal buoyant jets in cross flows

Turbulent Flow Behavior of Mixing Process Inside a Pharmaceutical Stirred Tank

CFD Simulation on Aerodynamic Performance of Hyperloop Vehicle

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