Abstract:Steady state heat and mass transfer between a submerged evaporative interface in a porous medium and an external gas stream were analyzed theoretically. Local and average evaporation rates for laminar and turbulent flow over a flat plate as well os for fully developed laminar or turbulent flow near the thermal entry region of a duct were obtained as a function of the position of the evaporative interface. Calculated local evaporation rates are significantly lower than values computed by Luikov, who did not tak… Show more
“…In this manner, Morgan and Yerazunis (14) were able to obtain a linear equation in q s (x) which can be expanded in a MacLaurin series in the parameter Θ/Bi, where Θ is related to the rise in the evaporative-interface temperature at the leading edge, Θ = ^^ (6.30) to -tw and Bi is the Biot number, the ratio of the thermal resistance of the porous solid to that of the air boundary layer.…”
Section: " W ) { P -Y «M*mentioning
confidence: 87%
“…6.4, has been described analytically in the following way. (14) The temperature at the exposed surface t s is related to the heat flux there q s {x\ and thus the [-(C/x) 4 ]*-1…”
Section: Undersurface Evaporationmentioning
confidence: 99%
“…Morgan and Yerazunis (14) also evaluate normalized rates of evaporation of water from 12-7-mm-thick beds of densely packed, uniform spheres with Θ-functions ranging from 0-137 (polystyrene) to 0-508 (steel). The normalized rates f(0/Bi) are plotted against relative depth ξ/b in Fig.…”
Section: Relative Fall In Evaporation Rate As Interface Withdraws Intmentioning
confidence: 99%
“…The spread of the curves is not very wide and thus approximately we can write Table 6.5. (14) The evaporation rate, then, is primarily a function of the Biot number, that is the thickness of the material being dried and the thermal conductance of the solid and of the air. Since the relative depth ξ/b is a function of the mean moisture content, equation (6.34) suggests that the relative drying rate of a given porous body depends only on its thickness and moisture content.…”
Section: Relative Fall In Evaporation Rate As Interface Withdraws Intmentioning
confidence: 99%
“…This conclusion forms the basis of the justification for drawing up characteristic drying curves for materials. The experimentally determined relationship (15) between relative depth of evaporation and moisture content is shown in Fig. 6.7 for a 12-7-mm-thick bed of closely graded, glass spherules (88 < d p < 105 μπι).…”
Section: Relative Fall In Evaporation Rate As Interface Withdraws Intmentioning
“…In this manner, Morgan and Yerazunis (14) were able to obtain a linear equation in q s (x) which can be expanded in a MacLaurin series in the parameter Θ/Bi, where Θ is related to the rise in the evaporative-interface temperature at the leading edge, Θ = ^^ (6.30) to -tw and Bi is the Biot number, the ratio of the thermal resistance of the porous solid to that of the air boundary layer.…”
Section: " W ) { P -Y «M*mentioning
confidence: 87%
“…6.4, has been described analytically in the following way. (14) The temperature at the exposed surface t s is related to the heat flux there q s {x\ and thus the [-(C/x) 4 ]*-1…”
Section: Undersurface Evaporationmentioning
confidence: 99%
“…Morgan and Yerazunis (14) also evaluate normalized rates of evaporation of water from 12-7-mm-thick beds of densely packed, uniform spheres with Θ-functions ranging from 0-137 (polystyrene) to 0-508 (steel). The normalized rates f(0/Bi) are plotted against relative depth ξ/b in Fig.…”
Section: Relative Fall In Evaporation Rate As Interface Withdraws Intmentioning
confidence: 99%
“…The spread of the curves is not very wide and thus approximately we can write Table 6.5. (14) The evaporation rate, then, is primarily a function of the Biot number, that is the thickness of the material being dried and the thermal conductance of the solid and of the air. Since the relative depth ξ/b is a function of the mean moisture content, equation (6.34) suggests that the relative drying rate of a given porous body depends only on its thickness and moisture content.…”
Section: Relative Fall In Evaporation Rate As Interface Withdraws Intmentioning
confidence: 99%
“…This conclusion forms the basis of the justification for drawing up characteristic drying curves for materials. The experimentally determined relationship (15) between relative depth of evaporation and moisture content is shown in Fig. 6.7 for a 12-7-mm-thick bed of closely graded, glass spherules (88 < d p < 105 μπι).…”
Section: Relative Fall In Evaporation Rate As Interface Withdraws Intmentioning
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