Engineering Answers

a 60 mm diameter pipe contains glycerine at2 20 c flowing at 8.5 m3/h. verify that the flow is laminar. for the pressure measurements hown, is the flow ascending or descending? what is the head loss for these pressure? take p glycerine = 1258 kg/m3, U glycerine = 1.49, g = 9.807

Two parallel rectangular surfaces 1m ×2m are opposite to each other at

a distance of 4m, The surfaces are black and at 100°C and 200°C.

Calculate the heat exchange by radiation between the two surfaces

Use Raoult's Law and calculate the vapour and liquid compositions in equilibrium (in mole fractions, y and x) for the A-B components system using vapour pressure data measured at a pressure of 101.32 kPa as shown in Table 1 below. Draw the Temperature composition diagrams the Equilibrium distribution (x-y) plot as well.

Table 1: vapour pressure data measure

Temperature

60

78

86

92

96

101

Vapour pressure

Component A

101.325

132

156

178

195

235

Component B

0

58

68

78

88

101.325

Methanol (M) is to be separated from water (W) by atmospheric distillation. The feed contains 22 kg/hr methanol and 25 kg/hr water. The distillate contains 90 mol% methanol and the bottom product contains 5 mol% of methanol. The feed is saturated.

(a) Calculate the molar flow rates of methanol and water in the bottom and distillate product stream.

(b) Determine the minimum number of stages and minimum reflux for the problem. If the equilibrium data is given as;

x 0.032 0.0523 0.075 0.154 0.225 0.349 0.813 0.918 1

y 0.19 0.2494 0.352 0.516 0.593 0.703 0.918 0.953 1

Methanol (M) is to be separated from water (W) by atmospheric distillation. The feed contains 22 kg/hr methanol and 25 kg/hr water. The distillate contains 90 mol% methanol and the bottom product contains 5 mol% of methanol. The feed is saturated. Calculate the molar flow rates of methanol and water in the bottom and distillate product stream.

200 kg/min of feed are fed to a continuous distillation column. The stream contains

70 kg /min NaOH and the difference is water. The distillate flows out of the column at

90 kg /min and contains 4 kg /min NaOH. Determine the bottom stream mass flow

rate and the composition of all streams. Draw and label the flowchart.

explain the importance of using a range of accurate design reference materials when developing design proposals