Buoyancy Effects on Heat and Mass Transfer in Boundary Layer on a Continuous, Moving Horizontal Plate

Abstract

The combined effects of buoyancy forces from t h e m 1 and mass diffurion in laminar boun&ry layer adjacent to a continuous, horirontal m t phte moving through an otherwise quiescent fluid are studied analytically by the local nonsimiloriry method of solution In the analysis. the diffusion-thenno and thermo-diffurin effects as well as the interfacial velocities due to mass diffusion are neglected Numerical results me presented for a Prundtl number of 0.7. with Schmidt numbers of 0.6 and 2.0, for thermal buoyancy parameter Gr,/Rep mnging from 0 to 1.0 and relative buoyancy parameter N = Gr,,,/Gr, from -0.5 to 2.0. In genetul, it her been found thar the wall shear stress and the surface heat and maw tramfer mres increase wirh inereusing thermal buoyancy force. These quantities are funher increased when the buoyancy force from mau dufusion assicrs the thermal buoyancy force, but are decreased when it opposes the thermal buoyancy force. While a Schmidt number of 0.6 ic found to yield higher wall shear stresses and surface heat mnsfer mtes, higher surface mass rmnsfer mres occur for a Schmidr number of 2.0. A compurison wirh the results for a srario~ry phte reveals that a continuous moving phte provides larger hear and mass transfer rates than a stationary plate.

Numerical solutions of the partial differential equations for investigating the significance of partial slip due to lateral velocity and viscous dissipation: The case of blood‐gold Carreau nanofluid and dusty fluid

“…However, Table 6 indicates that buoyancy does not affect dust's temperature. It is worth remarking that the results illustrated as Table 6 is in good agreement with the observation of Chen and Strobel [18] and Chandra and Chhabra [16]. However, the observed increment in the Nusselt number due to buoyancy had been pre‐determined and illustrated as figure 5 by Shah et al [65].…”

“…In most cases of fluid flow, buoyancy strongly affects the velocity of the transport phenomenon, shear stress, distribution of temperature, and concentration of the fluid [65]. Chen and Strobel [18] studied the combined effect of buoyancy forces on fluid flow over a horizontal flat object moving through a stagnant fluid and observed that not only the wall shear stress but also the mass transfer rate increases with an enhancement in thermal buoyancy force.…”

Mixed convection heat transfer from a vertical flat plate subjected to periodic oscillations

“…The velocity and temperature distributions on moving surfaces can affect the heat-transfer rate on the surface. Buoyancy effects within the boundary layer have been investigated by many researchers for continuously moving horizontal [10][11], oblique [12][13][14], and vertical surfaces [15][16][17].…”

Düşey Düz bir Levhanın Periyodik Salınımlarının Isı Transferine Etkisi

“…Salınımlı/hareketli yüzeyler üzerinde hız ve sıcaklık dağılımları yüzeydeki ısı transfer hızını etkileyebilir. Hareketli yüzeyler üzerinde sınır tabaka içindeki kaldırma etkileri yatay yüzeyler için [10][11], eğik yüzeyler için [12][13][14], düşey düzeyler için [15][16][17][18] pek çok araştırmacı tarafından incelenmiştir. Bu çalışmalardan, salınımlı akışların, yüksek ısı ve kütle transferine neden olduğu bilinmektedir.…”