Course Title: 
Mechanical Operations
Course Code: 
Year Taught: 
Subject Core
Undergraduate (UG)
School of Engineering

'Mechanical Operations' is a course offered in the third semester of B. Tech. in Chemical Engineering program at School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore.

Unit 1

Properties and handling of particulate solids- characteristics of solid particles, standard screen series, mixed particle size and screen analysis; Screening: Theory of screening, Effectiveness and Capacity of screens, Screening equipment: stationary screens and grizzlies, gyrating screens, vibrating screens and other industrial screens like trammels, etc. Transportation and storage of solids: bins, hoppers and silos, flow out of bins; conveyor selection, different types of conveyers and their performance characteristics.

Comminution of solids (Size Reduction): Factors affecting comminution, comminution laws: Kick’s law, Rittinger’s law and Bond’s law and their limitations. Crushing efficiency & power consumption, Size reduction equipments: Primary crusher – Jaw crusher, Gyratory crusher, Secondary crusher – Roll crusher (both smooth roll & toothed roll) its selection and capacity, Grinder – Construction and operation of Hammermill, Ball mill, Rod mill, Attrition mill, Agitated mill and their materials suitability, Ultra-fine grinder – Fluid energy mill, Cutting machines: knife cutters, Close circuit and Open circuit operation.

Unit 2

Separation of solids: gravity settling, sedimentation, thickening, elutriation, double cone classifier, rake classifier, bowl classifier.Centrifugal separation - continuous centrifuges, bowl classifier, super centrifuges, design of basket centrifuges; Industrial dust removing equipment - cyclones and hydro cyclones, with special reference to electrostatic and magnetic separators; Heavy media separations, floatation.

Mixing and Agitation: Mixing of liquids (with or without solids), mixing of liquids (with solids), mixing of liquids (with solids), mixing of powders, selection of suitable mixers, power requirement for mixing.

Unit 3

Filtration: Principle of Cake filtration, Pressure drop through filter media, compressible and incompressible filter cakes, Constant pressure and rate filtration, Continuous filtration, washing of filter cakes; Filtration – Theory, Filtration considerations, Batch and continuous filtration equipment (Pressure and Vacuum) – selection, operation and design of filters and optimum cycle of operation.

  • W. L. McCabe, J. C. Smith, and P. Harriot, “Unit Operations in Chemical Engineering, 6th Edition, McGraw Hill, 2001.
  • W. L. Badger and J. T. Banchero, “Introduction to Chemical Engineering“, Tata McGraw Hill, 1997
  • A. S. Foust, L. A. Wenzel, C. W. Clump, L. Naus, and L. B. Anderson, “Principles of Unit Operations“, 2nd Edition, John Wiley & Sons, 1994.
  • J. M. Coulson and J. F. Richardson,“Chemical Engineering Vol.I“, 4th Edition, Asian Books Pvt Ltd., India, 1998.