A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.

Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry

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Numerical Heat Transfer And Fluid Flow

The use of central receiver system (CRS) for electricity production promises to be one of the most viable options to replace fossil fuel power plants. Indeed, research and development activities on its basic subsystems have been booming rapidly since 1980s. This paper reviews the most important studies on the major components of central receiver solar thermal power plants including the heliostat field, the solar receiver and the power conversion system. After an overview of Concentrating Solar Power (CSP) technology, current status and applications of the CRSs are highlighted. Next, a detailed literature survey of existing design comprising optical, thermal and thermodynamic analysis, and techniques used to assess components have been arranged. This is followed by experimental investigations in which design concepts are established. The last section contains recent subsequent improvement of such key components as heliostat, receiver and hybrid solar gas turbine that are boosting in many R&D activities merging international collaboration during the past 30 years.

A review of studies on central receiver solar thermal power plants

Numerical and experimental study on the solidification of PCM around a vertical axially finned isothermal cylinder

Review of utilization of genetic algorithms in heat transfer problems

Measurements of the times of flight of sound waves can be used to determine temperature in a gas contained in a long tube which confines sound waves Sound pulses are transmitted and received by a suitable loud speaker attached to one end of the long tube A number of stubs or other discontinuities produce the sound reflections whose times of arrival are measured The time intervals yield average sound speeds in each interval between any two stubs from which temperatures are calculated Corrections for thermal expansion of the tube are easily made

System for temperature profile measurement in large furnances and kilns and method therefor

Interaction of surface radiation with free convection in a square cavity

Convection heat transfer from aluminium and copper foams in a vertical channel – An experimental study

Results of an experimental study of heat transfer by natural convection and surface radiation in an air-e lled squareenclosureusingadifferentialinterferometerarereported.Theenclosurecomprisestwodifferentiallyheated vertical walls and two horizontal adiabatic walls. The suppression of natural convection in the presence of surface radiation has been demonstrated experimentally. For the case of an enclosure with highly emissive walls, mean Nusselt number correlations for convection and radiation, as well as combined convection and radiation, are also presented in terms of Grashof number in the laminar range. Nomenclature d = width of the enclosure, m Gr = Grashof number, gb (Th i Tc)d 3 /m 2 h = local heat transfer coefe cient along the hot wall, W/m 2 K N h = average heat transfer coefe cient along the hot wall, W/m 2 K km = thermal conductivity of air at Tm, W/m K N Nuc = Nusselt number (mean) due to convection, [(qcd)]/[(Th i Tc)km] N Nur = Nusselt number (mean) due to radiation, [(qrd)]/[(Th i Tc)km] N Nur qc = convective heat e ux entering the enclosure from the hot wall, W/m 2 qr = radiative heat e ux entering the enclosure from the hot wall, W/m 2 qt = total heat e ux entering the enclosure, (qc C qr), W/m 2

S. P. Venkateshan

Papers

System for temperature profile measurement in large furnances and kilns and method therefor

Interaction of surface radiation with free convection in a square cavity

Convection heat transfer from aluminium and copper foams in a vertical channel – An experimental study

Effect of Surface Radiation on Natural Convection in a Square Enclosure

Conjugate turbulent natural convection with surface radiation in air filled rectangular enclosures