Question: water is to be boiled at an elevation of 1500...
Water is to be boiled at an elevation of 1500 m where the atmospheric pressure is 84.53 kPa. The boiling is carried out in stainless steel pan with a 30 cm diameter. The pan is placed on top of a 3-kW electric burner. If 60% of the heat generated by the burner is transferred to the water during boiling determine the temperature of the inner surface of the bottom of the pan. (Ans: 101.6oC)
Additional data and information:
hNB = nucleate boiling heat transfer coefficient (W m−2 K−1).
kL = thermal conductivity of the liquid (W m−1 K−1).
Cp,L = specific heat capacity of the liquid (J kg−1 K−1).
ρL = density of liquid (kg m−3).
σ = surface tension (N m−1).
µL = viscosity of the liquid (N s m−2).
ΔHvap = enthalpy of vaporization (J kg−1).
ρv = density of vapour (kg m−3).
ΔTe = excess temperature (K).
Ps = vapour pressure of liquid at surface temperature Ts (Pa).
Psat = saturation vapour pressure of liquid (Pa).
The following data are for water at 84.53 kPa and 95°C:
kL = 0.678 W m−1 K−1
Cp,L = 4212 J kg−1 K−1
ρL = 961.5 kg m−3
σ = 0.0599 N m−1
µL = 0.297x10−3 N s m−2
ΔHvap = 2270x103 J kg−1
ρv = 0.50 kg m−3
Ps = 101x103 Pa
Psat = 84.53x103 Pa
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