6533b7d7fe1ef96bd126788b
RESEARCH PRODUCT
A study of free convection in air around horizontal cylinders of different diameters based on holographic interferometry. Temperature field equations and heat transfer coefficients
R. BeldaJ.v. Herráezsubject
PhysicsConvectionNatural convectionHeat transferGeneral EngineeringThermodynamicsMechanicsHeat transfer coefficientCondensed Matter PhysicsHolographic interferometryNusselt numberDimensionless quantityForced convectiondescription
Abstract Holographic interferometry is used to study free convection in air around horizontal cylinders of different diameters and equal length, involving different surface temperatures, with the aim of defining the corresponding temperature fields. Interferograms were obtained to determine the temperature (T) of each point as well as its distance (x) from the surface of the cylinder. These values in turn made it possible to define functions (of an exponential nature in our case), T=f(x), that satisfactorily reproduced the temperature fields. Posteriorly, these functions were used to calculate the local convection coefficients, determining their dependency upon temperature and the direction of measurement. Finally, the exponential functions were transformed into dimensionless expressions, and the corresponding Nusselt numbers were calculated for Gr Pr product values of between 2.2×103 and 1.6×105.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-03-01 | International Journal of Thermal Sciences |