By J R Backhurst, J H Harker, J.F. Richardson
This quantity within the Coulson and Richardson sequence in chemical engineering comprises complete labored ideas to the issues posed in quantity 1. when the most quantity includes illustrative labored examples during the textual content, this ebook comprises solutions to the more difficult questions posed on the finish of every bankruptcy of the most text.
those questions are of either a regular and non-standard nature, and so will turn out to be of curiosity to either educational employees educating classes during this sector and to the prepared pupil. Chemical engineers in who're trying to find a typical technique to a real-life challenge also will locate the publication of substantial curiosity.
* a useful resource of knowledge for the scholar learning the fabric contained in Chemical Engineering quantity 1
* A worthy approach to studying - solutions are defined in complete
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Extra resources for Chemical engineering. Solutions to the problems in chemical engineering
A pitot tube is used to measure the velocity profile over the cross-section. Confirm that the information given below is consistent with the laminar flow of a power-law fluid. 34 Thus, the calculated and experimental values of ux /uCL agree within reasonable limits of experimental accuracy. 150 Ns/m2 ) is flowing through a pipe of diameter 40 mm and length 200 m. Starting with the rheological equation, show that the relation between pressure gradient P/l and volumetric flowrate Q is: QD P r 4 1 8l p 1 4 X C X4 3 3 where l is the pipe radius, p is the plastic viscosity, and X is the ratio of the yield stress to the shear stress at the pipe wall.
Annual charges are a fraction ˇ of the capital cost. Obtain an expression for the optimum pipe diameter on a minimum cost basis for a fluid of density and viscosity flowing at a mass rate of G. Assume that the fluid is in turbulent flow and that the Blasius equation is applicable, that is the friction factor is proportional to the Reynolds number to the power of minus one quarter. Indicate clearly how the optimum diameter depends on flowrate and fluid properties. Solution The total annual cost of a pipeline consists of a capital charge plus the running costs.
32 A fluid with a finite yield stress is sheared between two concentric cylinders, 50 mm long. The inner cylinder is 30 mm diameter and the gap is 20 mm. The outer cylinder is held stationary while a torque is applied to the inner. 01 Nm. 1 Ns/m2 . Solution Concentric-cylinder viscometers are in widespread use. Figure 3d represents a partial section through such an instrument in which liquid is contained and sheared between the stationary inner and rotating outer cylinders. Either may be driven, but the flow regime 44 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Pointer Retaining spring ro ri h Rotating outer cylinder Stationary inner cylinder Figure 3d.