Natural Convection from the Outside Surface of an Inclined Cylinder in Pure Liquids at Low Flux

Abstract

Many studies have investigated natural convection heat transfer from the outside surface of horizontal and vertical cylinders in both constant heat flux and temperature conditions. However, there are poor studies in natural convection from inclined cylinders. In this study, free convection heat transfer was examined experimentally from the outside surface of a cylinder for glycerol and water at various heat fluxes. The tests were performed at 10 different inclination angles of the cylinder, namely, φ = 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, and 90°, measured from the horizon. Our results indicated that the average Nusselt number reduces with the growth in the inclination of the cylinder to the horizon at the same heat flux, and the average Nusselt number enhanced with the growth in heat flux at the same angle. Also, the average Nusselt number of water is greater than that of glycerol. A new experimental model for predicting the average Nusselt number is suggested, which has a satisfactory accuracy for experimental data.

Experimental Investigation of Heat Transfer Effects of Mechanical Agitation in Pool Boiling

“…Literatürde havuz kaynama ısı transferinde en çok kullanılan hata analiz metodu kullanılarak (Akbari et al, 2019), ısı transfer katsayısı için bağıl hata ±%3,1 ve ısı akısı için bağıl hata ±%3,35 hesap edilmiştir.…”

MHD Flow of a Hybrid Nano-Fluid in a Triangular Enclosure with Zigzags and an Elliptic Obstacle

“…Convection has always been the primary focus of research [1] for a variety of heating and cooling engineering systems. A modification of the geometrical shape of the system [2,3] was recently agreed upon among researchers in order to achieve spectacular optimization of the heat-transfer performance, from circular [4] and square geometries [5] to non-square geometries [6][7][8][9] (triangular, trapezoidal, etc.) as it has been proven by many research papers that aspect ratio and type of the geometry have a huge impact on thermal performance [10][11][12].…”

Scaling laws for natural convection boundary layer of a Pr > 1 fluid on a vertical solid surface subject to a sinusoidal heating flux in a linearly stratified ambient

“…Another example is the unsteady NCBL flow of fresh or seawater () on the sidearm of a reservoir or ocean which is also caused by the absorbed sinusoidal solar radiation 40,41 . Much higher Pr fluids have also been studied for many practical applications involving unsteady NCBL flows, such as engine oil nanofluids () 42 and glycerin and its mixtures with water () 43–45 …”

“…40,41 Much higher Pr fluids have also been studied for many practical applications involving unsteady NCBL flows, such as engine oil nanofluids ( ≲ ≲ 10 Pr 1000) 42 and glycerin and its mixtures with water ( ≲ ≲ 50 Pr 10000). [43][44][45]…”