+ All Categories
Home > Documents > Determination of Head Loss in Fixed & Fluidised Bed

Determination of Head Loss in Fixed & Fluidised Bed

Date post: 17-Dec-2015
Category:
Upload: elaine-pui
View: 76 times
Download: 7 times
Share this document with a friend
Description:
Fixed and Fluideised bed
Popular Tags:
7
Mass & Heat Transfer Lab BKF3721 Faculty of Chemical & Natural Resources Engineering Experiment 6 DETERMINATION OF HEAD LOSS IN FIXED AND FLUIDIZED BED Name Matric No. Group Program Section Date
Transcript

Mass & Heat Transfer Lab BKF3721

Faculty of Chemical & Natural Resources Engineering

Experiment 6DETERMINATION OF HEAD LOSS IN FIXED AND FLUIDIZED BED

Name

Matric No.

Group

Program

Section

Date

Semester II - Session 2013/2014

Experiment 6: DETERMINATION OF HEAD LOSS IN FIXED AND FLUIDIZED BED

EXPERIMENT AOBJECTIVE(S)

1. To investigate the characteristics associated with water flowing vertically upwards through a bed of granular material2. To determine the head loss (pressure drop)3. To verify, the CarmanKozeny equation4. To observe the onset of fluidization and differentiate between the characteristics of a fixed bed and a fluidized bed5. To compare the predicted onset of fluidization with the measured head loss

EQUIPMENT/APPARATUS/MATERIAL

1. Weigh balance (typical range 1 kg)2. Measuring cylinder3. CEL With the water circuit filled with coarse ballotini (glass beads with a nominal diameter of 485 microns).

Figure 1.0: CEL With the water circuit filled with coarse ballotini

EXPERIMENTAL PROCEDURE

1. Switch on water pump.2. Adjust the water flow rate in increments of 0.1 L/min from 0. 1 L/min to maximum flowrate. At each setting allow the conditions to stabilize and then record the height of the bed, the differential reading on the manometer and the physical state of the bed.

Table 1: Experimental DataFlow Rate(L/min)Bed Height(mm)Bed PressureDrop (mm. H20)Bed State

Determine the particle density by weighing a known volume of the ballotini. Note: For the finer ballotini = 0.367 and Dp = 0.285 m.

Density W =Viscosity W =Kinematics viscosity W=Particle size DP =Particle density S =Bed height L=Bed crosssection A=Mass of particles=

DISCUSSION

1.Draw the graph of bed pressure drop against water flow rate from the experimental values obtained.2.Compare the predicted fluidisation point with the actual fluidisation point obtained from the graph. Give reasons for any discrepancies between the two values.

EXPERIMENT BOBJECTIVES

1. To investigate the characteristics associated with air flowing vertically upwards through bed of granular material.2. To determine the head loss (pressure drop).3. To verify the CarmanKozeny equation.4. To observe the onset of fluidization and differentiate between the characteristics of a fixed bed and fluidized bed.5. To compare the predicted onset of fluidization with the measured head loss

EQUIPMENT/APPARATUS/MATERIAL

1. Weigh balance (typical range 1 kg)2. Measuring cylinder3. CEL With the air circuit filled with fine ballotini (glass beads with a nominal diameter of 285 microns).

Figure 2.0: CEL With the air circuit filled with fine ballotini

EXPERIMENTAL PROCEDURE

1. Switch on the air pump.2. Adjust the air flow rate in increments of 1.0 L/min. from 1 L/min to maximum flowrate. At each setting allow the conditions to stabilise then record the height of bed, the differential reading on the manometer and state of the bed. Increase flow rate in steps of 1.0 L/min and tabulate results.

Table 2: Experimental DataFlow Rate(L/min)Bed Height(mm)Bed PressureDrop (mm H20)Bed State

Determine the particle density by weighing a known volume of the ballotini. Note: For the coarser ballotini = 0.425 and DP = 0.485 m.

Density of water W=Density of air a =Dynamic viscosity of air a =Kinematic viscosity of air a=Particle size DP =Particle density S = Bed height L=Bed crosssection A=Mass of particles=

DISCUSSION

1.Draw a graph of pressure drop against the air flow rate from the experimental values obtained.2.Compare the predicted fluidization point with the actual fluidization point obtained from the graph. Give reasons for any discrepancies between these values.


Recommended