CHEMICAL ENGINEERING
PUMPING OF FLUIDS 115 PROBLEM 8.9 A single-acting air compressor supplies 0.1m^3 /s of air (at STP) compressed to 380 kN/m^2 fro ...
116 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS In this problem,ND10 Hz,QD 0 .4m^3 /s, andhD20 m. Thus: NsD 10 ð 0. 4 ^0.^5 / 9. ...
PUMPING OF FLUIDS 117 The losses in the suction pipeD 1 .5m,andui^2 / 2 gDhfD 1. 5 The net positive suction head (NPSH) is dis ...
118 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS PROBLEM 8.14 1250 cm^3 /s of water is to be pumped through a steel pipe, 25 mm diame ...
PUMPING OF FLUIDS 119 Water velocityD 0. 0001 / 0. 0000785 D 1 .273 m/s. Entry pressure drop is: PfD u^2 2 ( 1 Cc 1 ) 2 ( ...
120 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS PowerDmass flowrateðheadðg (equation 8.61) D 3. 0 ð 37. 6 ð 9. 81 D1105 W If the ...
PUMPING OF FLUIDS 121 Solution Cross-sectional area of pipeD/ 4 0. 0025 ^2 D 0 .00049 m^2. Volumetric flowrateD 1. 3 / 1. ...
122 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS If the pump efficiency is 50%, powerDheadðmass flowrateðg/ 0. 5 Dpressure drop (N/ ...
PUMPING OF FLUIDS 123 PROBLEM 8.21 600 litres/s of water at 320 K is pumped in a 40 mm i.d. pipe through a length of 150 m in a ...
124 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The cross-sectional area of the pipeD/ 4 0. 152 D 0 .0177 m^2. Velocity of the w ...
SECTION 9 Heat Transfer PROBLEM 9.1 Calculate the time taken for the distant face of a brick wall, of thermal diffusivity,DHD 0 ...
126 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS PROBLEM 9.2 Calculate the time for the distant face to reach 470 K under the same co ...
HEAT TRANSFER 127 From (iii), NDB 2 ex p p/DH (^) D (^0) p (^1) ekppwherekDx/pD H The Laplace transform ofp^1 ek pp Derfc ...
128 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution At 101.3kN/m^2 , benzene condenses atTsD353 K. With a wall temperature ofTw ...
HEAT TRANSFER 129 xx^0.^25 x^0.^25 sh (m) (m) W/m^2 K 00 1 0 1 0.1 0.562 1.778 1. 58 ð 10 ^4951 0.2 0.669 1.495 1. 89 ð 10 ^4 ...
130 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Film coefficients Inside: hidi/kD 0. 023 dG^0 /^0.^8 Cp/k^0.^4 (equation 9.61) ...
HEAT TRANSFER 131 Area required In equation 9.1,ADQ/UmD 74. 7 ð 103 / 63. 7 ð 180 D 6 .52 m^2. Area/unit length of tubeD $/ ...
132 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS larger concentric pipe; the oil and water moving in opposite directions. The oil ent ...
HEAT TRANSFER 133 thermal conductivity 0.3 W/m K is added, what temperatures will its surfaces attain assuming the inner surface ...
134 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS T 3 hQDh T 3 290 T 2 DT 3 CQ/ 12 QD 14 , 000 10 T 2 (K) (W/m^2 K) (W/m^2 )(K) ...
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