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IJSTR >> Volume 2- Issue 11, November 2013 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Flux Enhancement By Shear Free Surfaces In A Turbulent Convection

[Full Text]

 

AUTHOR(S)

Snigdha Lal, Seema Mahto, V. N. Bartaria

 

KEYWORDS

Index Terms: Axially homogeneous flow, Buoyancy driven flow, Drag reduction, Flux enhancement, Kinematic wall blocking, Shear free surfaces, Turbulent convection.

 

ABSTRACT

Abstract: In this Paper we will be dealing with turbulent natural convection in a long vertical pipe in which the flow is generated because of an unstable density difference across the two ends of the pipe. We create the density difference across the pipe using fresh water and brine. Since the density of brine is greater than that of fresh water, it tries to settle down while the fresh water tries to fill up the upper space. This creates collision of fluid masses in the pipe, leading to a turbulent flow at high levels of density differences. We will study the flow and its effect in the mid section of the pipe. Since water is an incompressible fluid, because of the density difference, the mass of fluid that goes up is equal to the mass of the fluid going down. Thus at any instant of time, the net flow will be zero at any cross section of the pipe. Since the length to diameter ratio (L/d ratio) of the pipe is around 9 to 10, the flow will be axially homogeneous. Thus we have an axially homogenous flow with zero mean velocity and which is purely buoyancy driven. This is the basic flow for our experiments.

 

REFERENCES

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[2]. Kathuria, A. and Shukla, G. Experimental investigation of drag reduction by macro additives in a turbulent pipe flow, SURA report, IIT Delhi, 2008

[3]. Raja Vamsi, G.,2009 Drag reduction by modifying the large scales of a Turbulent Channel flow, Master of Technology Thesis, Department of Applied Mechanics, IIT-Delhi.

[4]. Tarak Kumar Sahoo, 2010 Drag reduction by modifying large scales of a Turbulent flow, Master of Technology Thesis, Department of Applied Mechanics, IIT-Delhi.

[5]. Cholemari, M. R. Flux enhancement by modifying the large scales of a turbulent flow, Unpublished.

[6]. CRC Handbook of Physics and Chemistry, 82nd Edition, Lide, D. R., Ed.,CRC press, 2001.

[7]. Cholemari, M.R. and Arakeri, J.H. Experiments and a model of turbulent exchange flow in a vertical pipe, Int. J. Heat Mass Trans., 48, pp. 4467-4473, 2005.

[8]. Cholemari, M.R. and Arakeri, J.H. Axially homogeneous, zero mean flow buoyancy-driven turbulence in a vertical pipe, J. Fluid Mech., 621, pp 69-102, 2009.