Estimate the interfacial heat transfer coefficient for evaporation of a thin film of saturated liquid water at atmospheric pressure. The liquid film rests on a flat, solid surface to which a constant and uniform heat flux of 150 kW/m² is applied. The accommodation coefficient may be taken to be 0.05. If the liquid film thickness is 0.2 mm, compare the interfacial vaporization resistance with the conduction resistance through the liquid film.

Liquid mercury at 0.5 kg/s is to be heated from 300K to 400K by passing it through a 50mm diameter tube whose surface is maintained at 450K. Calculate the required tube length by using an appropriate liquid metal convection heat transfer correlation. Compare your result with that which would have been obtained by using a correlation approximate for Pr > 0.7.

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Determine the evaporation rate when a container contains  hot water and the surface temperature of the container is 75◦C is placed in an air stream that has a mass fraction of water equal to 0.25. For the water over pan  If the average mass transfer coefficient  is gm,H2O = 0.370 kg/m2·s and the container has a surface area of 0.16 m2     Please make it fast , if not sure skip ,don't give wrong , may downvote

Proflem # 27. iA fillud with water to a level and is éxposed, to dng air at 30°C. 40 mm deep a pan of of 20 mm mass diffusivity fove for time' reguired evapor ate. -3 m² /. for all the water to 2.5x 10

Please solve this problem, Thank you very uch

An open tank, 6 mm in diameter, contains 1 mm deep layer of benzene (Mol wt = 78) at its bottom. The vapour pressure of benzene in the tank is 13.15 kN/m2 and its diffusion takes place through a stagnant air film 2.5 mm thick, At the operating temperature of 20°C, the diffusivity of benzene in the tank is 8.0 x 10-6 m2/s. If the benzene has a density of 880 kg/m³, calculate the time taken for the entire benzene to evaporate. Take atmospheric pressure as 101.3 kN/m² and neglect any resistance to diffusion of benzene beyond the air film. %3D

A spherical, stainless steel (AISI 302) canister is used to store reacting chemicals that provide for a uniform heat flux q”i to its inner surface. The canister is suddenly submerged in a liquid bath of temperature T∞ i, where Ti is the initial temperature of the canister wall. (a) Assuming negligible temperature gradients in the canister wall and a constant heat flux , develop an equation that governs the variation of the wall temperature with time during the transient process. What is the initial rate of change of the wall temperature if q”I = 105 W/m2? (b) What is the steady-state temperature of the wall?  (c) The convection coefficient depends on the velocity associated with fluid flow over the canister and whether the wall temperature is large enough to induce boiling in the liquid. Compute and plot the steady-state temperature as a function of h for the range 100 ≤ h ≤ 10,000 W/m2 ∙ K. Is there a value of h below which operation would be unacceptable?

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An ordinary egg can be approximated as a 5.5-cm-diameter sphere whose thermal conductivity of roughly k = 0.6- W mk overall density of p = 1000; and heat capacity of C₂ = 3000- kg m² The egg is initially at a uniform temperature of T₂ = 10°C and is dropped into boiling water at T.. = 90°C W - determine how long it will take for the egg to m²K Taking the convective heat transfer coefficient to be h reach T = 70°C. In solving the problem, please follow the steps below. For the Lump Model In solving this problem, please use the lump model method (ignoring the requirement of small Biot number and discuss the outcomes, 1. 2. Compute the characteristic length Lc Compute the volume and surface area of the sphere (as the egg model) Vol As 3. Compute the diffusivity α = = 10- k p Cp = J kgk Compute non-dimensional excessive temperature 0 = h Lc k 4. Compute the Biot number using the characteristic length found above Bi = T-Too 5. Ti-Too 6. Calculate the Fourier number from the equation =…