tugas 2 peristiwa perpindahan

7/22/2019 Tugas 2 Peristiwa Perpindahan

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DEPARTEMEN TEKNIK KIMIA UNIVERSITAS INDONESIA 1

Nama : Rizqi Pandu Sudarmawan

NPM : 0906557045

1. Water at 68oF is to be pumped through 95 ft of standard 3-in pipe (internal diameter 3.068 in.) into anoverhead reservoir.

What pressure is required at the outlet of the pump to supply water to the overhead reservoir at a rate of

18 gal/min? At 68oF the viscosity of the water is 1.002 cp and the density is 0.9982 g/ml.

Answer:


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2. How many gal/hour of water at 68oF can be delivered through a 1320-ft length of smooth 6.00-in. i.d.pipe under a pressure difference of 0.25 psi? Assume that the pipe is hydraulically smooth.

Answer:


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Q =

x

= 4080 gal/hr.

3. A hollow sphere, 5.00 mm in diameter, with a mass of 0.0500 g, is released in a column of liquidand attains a terminal velocity of 0.500 cm/s. The liquid density is 980.7 cm/sec2. The sphere is far

enough from the containing walls so that their effect can be neglected.

(a). Compute the drag force on the sphere in dynes.

(b). Compute the friction factor.

(c). Determine the viscosity of the liquid.

Answer:

4. (a) Explain how to find the sphere diameter D corresponding to given values of v , ,s, , and gby making a direct construction on Fig. 6.3-1.

(b) Rework Problem 2A.4 by using Fig. 6.3-1.

(c) Rework (b) when the gas velocity is 10 ft/s.

Answer:


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Problem 2 A.4. Estimate the maximum diameter of microspherical catalyst particles that could be

lost in the stack gas of a fluid cracking unit under the following conditions:


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5. A tube of 146 sq. in . cross section and 73 in. height is packed with spherical particles of diameter 2mm. When a pressure difference of 158 psi is maintained across the column, a 60% aqueous sucrose

solution at 20oC flows through the bed at a rate of 244 lb/min. At this temperature, the viscosity of

the solution is 56.5 cp and its density is 1.2865 g/cm3. What is the void fraction of the bed? Discuss

the usefulness of this method by obtaining the void fraction.

Answer:


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6. Gaseous nitrogen is in isothermal turbulent flow at 25oC through a straight length of horizontal pipewith 3-in. inside diameter at a rate of 0.28 lbm.sec

-1.The absolute pressure at the inlet and outlet are 2

atm and 1 atm, respectively. Evaluate , assuming ideal gas behavior and radially uniform

velocity distribution.

Answer:


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7.

Answer:

We start with Eq. 7.5-10, taking plane 1 at the top of the slurry dispersion and plane 2 right at theoutlet to the dgester; we also taje plane 2 to be the datum place for the calculation of the potential

energy:


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8.

Answer:


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tugas 2 peristiwa perpindahan

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