Reference no: EM131324124
Problem -
a. Consider a one-component system consisting of spherical bubbles of vapor inside a liquid, which is commonly observed as a liquid begins to boil. This is similar to the case considered in class in which liquid droplets were suspended in a vapor, but the identity of the phases is reversed (here α = liquid, β = vapor). If the liquid is in equilibrium with the vapor in the bubbles, it can be shown that:
VβdPβ = ΔHv(dT/T)
where T is the boiling temperature. Beginning with this equation, derive the following equation showing the variation of boiling temperature with bubble size:
(1/To) - (1/Tr) = (R/ΔHv)ln(1 + (2γ/rPα))
Briefly explain any non-mathematical steps. Assume that the vapor can be treated as an ideal gas and state any other assumptions you make.
In this equation:
To = boiling temperature for a flat interface, K
Tr = boiling temperature for the liquid layer surrounding a bubble of radius r, K
ΔHv = enthalpy of vaporization, J/mole
γ = surface energy of the liquid/bubble interface, J/m2
b. For liquid Na, the 1 atm boiling temperature is 1150 K for a flat liquid-vapor interface, ΔHv = 101.3 kJ/mole and γ = 0.19 1/m2. If the liquid pressure is 1 atm, calculate (i) the pressure (in atm) inside a Na bubble with a radius of 1 μm and (ii) the boiling temperature for the liquid layer surrounding a Na bubble with a radius of 1 μm.
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