A series of water-filled trays, each 222 mm long, experiences an evaporative drying process. Dry air at T∞ = 300 K flows over the trays with a velocity of 15 m/s, while radiant heaters maintain the surface temperature at Ts = 330 K.

(a) What is the evaporative flux (kg/s ∙ m2) at a distance 1 m from the leading edge?

(b) What is the irradiation (W/m2) that should be supplied to the tray surface at this location to maintain the water temperature at 330 K?

(c) Assuming the water temperature is uniform over the tray at this location, what is the evaporation rate (kg/s ∙ m) from the tray per unit width of the tray?

(d) What irradiation should be applied to each of the first four trays such that the corresponding evaporation rates are identical to that found in part (c)?

Transcribed Image Text:

ilutulludlillim Dry air -Radiant heaters Water-filled tray 111