Suscripción a Biblioteca: Guest
Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones
International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110

Volumes:
Volumen 46, 2019 Volumen 45, 2018 Volumen 44, 2017 Volumen 43, 2016 Volumen 42, 2015 Volumen 41, 2014 Volumen 40, 2013 Volumen 39, 2012 Volumen 38, 2011 Volumen 37, 2010 Volumen 36, 2009 Volumen 35, 2008 Volumen 34, 2007 Volumen 33, 2006 Volumen 32, 2005 Volumen 31, 2004 Volumen 30, 2003 Volumen 29, 2002 Volumen 28, 2001 Volumen 27, 2000 Volumen 26, 1999 Volumen 25, 1998 Volumen 24, 1997 Volumen 23, 1996 Volumen 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i1-3.180
pages 212-219

Rough-Wall Heat Transfer in Tbrbulent Boundary Layers

M. H. Hosni
Department of Mechanical Engineering, Kansas State University, Manhattan, USA
H. W. Coleman
Mechanical Engineering Department, University of Alabama in Huntsville, Huntsville, USA
Robert P. Taylor
Mechanical Engineering Department, Mississippi State University, Mississippi State, MS, USA 39762

SINOPSIS

Measurements for heat transfer in the rough wall turbulent boundary layers are presented. This paper summarizes the previous experimental results for six test surfaces five rough and one smooth. Three of the rough surfaces are smooth plates roughened with hemispherical elements uniformly distributed 2, 4, and 10 base diameters apart. The remaining two rough surfaces are smooth plates roughened with truncated, right circular cones uniformly distributed 2 and 4 base diameters apart. Both of the roughness geometries hemispheres and truncated cones have a 1.27 mm base diameter and a roughness height of 0.635 mm. The Stanton number data are for zero pressure gradient incompressible turbulent boundary layer air flow for several freestream velocities ranging from 6 to 66 m/s which cover the aerodynamically smooth transitionally rough and fully rough flow regimes. These data are compared with previously published results from another similar test facility using a rough surface comprised of spheres of a single size (1.27 mm diameter) packed in the most dense array. It is shown that data for a given rough surface viewed in Stanton number versus enthalpy thickness coordinates do not collapse to a single curve in the fully rough regime as had been postulated based on observations of a single set of rough wall data. The heat transfer data also show that for a given surface Stanton number data in Rex, coordinates approach an asymptotic curve as freestream velocity is increased, becoming a function of Rex, alone (as in the case for smooth wall turbulent flows). However, there is a different asymptotic St-Rex curve for each rough surface, with Stanton number at a given Rex, increasing with decreasing roughness spacing, that is as the surface becomes "rougher". The data also show a measurable difference in Stanton numbers due to roughness elements shape effects.


Articles with similar content:

ESTIMATING THE FRICTION VELOCITY IN A TURBULENT PLANE WALL JET OVER A TRANSITIONALLY ROUGH SURFACE
TSFP DIGITAL LIBRARY ONLINE, Vol.8, 2013, issue
Donald J. Bergstrom, James D. Bugg, Noorallah Rostamy, David Sumner
STATISTICS AND SCALING OF ADVERSE PRESSURE GRADIENT TURBULENT BOUNDARY LAYERS
TSFP DIGITAL LIBRARY ONLINE, Vol.9, 2015, issue
Callum Atkinson, Julio Soria, Abel-John Buchner, Vassili Kitsios
Reappraisal of the asymptotic state of a zero pressure gradient turbulent boundary layer
TSFP DIGITAL LIBRARY ONLINE, Vol.10, 2017, issue
Krishna M. Talluru, Lyazid Djenidi, Robert Anthony Antonia
NATURAL CONVECTION OF POWER LAW FLUIDS FROM A VERTICAL PLATE WITH UNIFORM SURFACE HEAT FLUX
International Heat Transfer Conference 5, Vol.4, 1974, issue
J. L. S. Chen, A. Boehm
MEAN AND TURBULENT VELOCITY PROFILES FOR SANDGRAIN ROUGH SURFACES
TSFP DIGITAL LIBRARY ONLINE, Vol.3, 2003, issue
Karen A. Flack, Michael P. Schultz