Reconsider Prob. 4–110. Using EES (or other) software, investigate the effect of the initial temperature of the ice block on the time period before the ice block starts melting. Let the initial temperature vary from 226°C to 24°C. Plot the time versus the initial temperature, and discuss the results.

Data From problem 110

A 5-cm-high rectangular ice block (k = 2.22 W/m · K and α = 0.124 × 10^-7 m²/s) initially at 220°C is placed on a

table on its square base 4 cm × 4 cm in size in a room at 18°C. The heat transfer coefficient on the exposed surfaces of the ice block is 12 W/m² · K. Disregarding any heat transfer from the base to the table, determine how long it will be before the ice block starts melting. Where on the ice block will the first liquid droplets appear?

Transcribed Image Text:

Room air 18°C Ice block -20°C