Through this device, students can understand the factors affecting the drying rate curve; by using wet-bulb and dry-bulb temperatures to measure the humidity of moist air, they can master the determination methods of drying curves and drying rate curves, and comprehend the significance of the process for determining the drying rate curve; additionally, they can learn the determination method of the convective heat transfer coefficient between the material and air during the constant-rate drying stage.

The device includes the structures and working principles of four different types of trays: sieve trays, bubble caps, serrated trays, and valve trays. The experimental process covers the measurement of single-tray pressure drop, as well as the observation of phenomena such as liquid leakage, mist entrainment, and downcomer flooding.

Through this comprehensive device, students can learn no less than 13 teaching knowledge points, including relatively thin pipes, relatively thick pipes, rough thin pipes, rough thick pipes, laminar flow pipes, local valves, abrupt contraction pipes, orifice plate flowmeters, venturi flowmeters, centrifugal pump performance curves, pipeline performance curves, inverted U-tube manometers, and volume method flowmeters.

Master the determination method of the convective heat transfer coefficient αi, and deepen the understanding of its theoretical basis and influencing factors; Master the application of linear regression analysis to determine the values of constants A and m in the heat transfer correlation Nu=AR^mPr^0.4; Deepen the understanding of the basic theory of enhanced heat transfer through data comparison between threaded tubes and smooth tubes; Understand the structure of shell-and-tube heat exchangers and learn the determination methods for their heat transfer coefficients and average driving forces;