SYSTEM

The compressor in a conveying line system is pushing dry air at 2.2 atm gauge pressure into the system. You can get the average viscosity of the air as 1x10 Pas. The air pressed into the system first passes through a horizontal channel with a rectangular cross-section of 13 cm 21 cm and a length of 12 m. At the end of this channel, there is a connection element (converter) that connects the rectangular section to the circular section. In this way, the air passes to another circular pipe with a 15 cm handle at 3 atm absolute pressure, and in this pipe it flows 1 m horizontally up to a 90" elbow and 2 m more vertically upwards after the elbow. At the end of the circular cross-section pipe, again at the same diameter (15 cm). a fluid enters the bed. In order to measure the average velocity of the air in the circular section pipe, an orificemeter was used on the circular section line after the elbow. A 27% narrowing was achieved in the orificemeter. The density of the manometer liquid used in the U-tube manometer connected to the orificemeter is 2580 kg/m3 and the height difference of the liquid read between the manometer arms is 20 cm. Orificemeter Coefficient 0.59 can be taken. You can get the average density of the air passing through the orificemeter as approximately 2.9 kg/m. It has been determined that the average velocity of the air entering the bed, which is determined by using the orificemeter, is the minimum fluidity rate that will enable the bed to become fluid. The height and porosity values for the bed at minimum fluidity conditions are given below. It is known that food particles with a density of 1284 kg/m are processed in the fluidized bed. Bed height and porosity values at minimum fluidic conditions can be taken as Lmf= 0.33 and = 0.8.

In order to detect the pressure drop in the fluidized bed in the system, another U-top manometer is mounted on the bed inlet and outlet. The density of the liquid in the manometer is 1600 kg/m? Stop. In order to ensure that the system works smoothly under these conditions, it is desired to determine what the average particle diameter of the food particles with the sphericity factors given below should be. For trouble-free operation of this system, sphericity factor of food particles is =0.62.

Calculate the design parameters in the questions below using the system specifications given.

1)Make a schematic representation of the system. Show all given system parts schematically on the system. Mark the points given to you on the schematic system.

2)Find the average velocities of the air in the circular pipe and the rectangular duct.

3) If you need to take the exit pressure from the orificemeter as the inlet pressure to the bed, what would the pressure of the mortar entering the bed be?

4)What should be the average particle diameter of the food particles that you need to place in order to maintain the fluidized bed state in which the design conditions given to you are valid? Identify and interpret.

5)What will be the observed fluid height difference between the two arms of the U-tube manometer attached to the fluidized bed?

6) What will be the drag force acting on a single particle moving independently in the bed? Please comment.