Free-convection effects inside tubes of flat-plate solar collectors
1966; Elsevier BV; Volume: 10; Issue: 4 Linguagem: Inglês
10.1016/0038-092x(66)90015-6
ISSN1471-1257
Autores Tópico(s)Nanofluid Flow and Heat Transfer
ResumoAn experimental and theoretical study of the effects of free convection superimposed on forced flow in inclined tubes is made. The theoretical analysis considered fully developed laminar flow under uniform heat flux and constant pressure gradient. Solutions for velocity and temperature equations have been obtained by perturbation analysis, in terms of power series of Rayleigh number. Nusselt number has been evaluated on bulk temperature difference basis and a maximum value of it appears to lie between 20 deg and 60 deg of tube inclination. An experimental study was done for 45 deg tube inclination and also for vertical position.
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