CHEMICAL ENGINEERING
PAPER-I
Section- A
a) Fluid and Particle Dynamics: Viscosity of fluids. Laminar and turbulent flows. Equation of continuity and Navier- Strokes equation-Bernoulli’s theorem. Flow meters. Fluid drag and pressure drop due to friction, Reynold’s Number and friction factor-effect of pipe roughness. Economic pipe diameter. Pumps, water, air/stream jet ejectors, compressors, blowers and fans. agitation and mixing of liquids, Mixing of solids and pastes. Crushing and Grinding Principles and equipment. Rittinger’s and Bond’s laws. Filtration and filtration equipment. Fluidparticle mechanics – free and hindered setting. Fluidisation and minimum fluidisation velocity, concepts of compressible and incompressible flow. Transport of solids.
b) Mass Transfer: Molecular diffusion coefficients, First and second law and diffusion, mass transfer coefficients, film and penetration theories of mass transfer. Distillation, simple distillation, relative volatility, fractional distillation, plate and packed columns for distillation. Calculation of theoretical number of plates. Liquid-liquid equilibria. Extraction – theory and practice; design of gas-absorption columns. Drying, Humidification, dehumidification. Crystallisation. Design of equipment.
c) Heat Transfer: Conduction, thermal conductivity, extended surface heat transfer. Convection – free and forced. Heat transfer coefficients – Nusselt Number. LMTD and effectiveness. NTU methods for the design of Double Pipe and Shell & Tube Heat Exchangers. Analogy between heat and momentum transfer, Boiling and condensation heat transfer, Single and multiple-effect evaporators. Radiation – Stefan-Boltzman Law, emissivity and absorptivity. Calculation of heat load of a furnace. Solar heaters.
Section – B
d) Novel Separation Processes: Equilibrium separation processesionexchange, osmosis, electro-dialysis, reverse osmosis, ultra-filtration and other membrane processes. Molecular distillation. Super critical fluid extraction.
e) Process Equipment design: Factors affecting vessel design criteria Cost considerations, Design of storage vessels-vertical, horizontal spherical, underground tanks for atmospheric and higher pressure. Design of closures flat and eliptical head. Design of supports, Materials of construction-characteristics and selection.
f) Process Dynamics and Control: Measuring instruments for process variables like level, pressure, flow, temperature pH and concentration with indication in visual/pneumatic/analog/ digital signal forms. Control variable, manipulative variable and load variables. Linear control theory-Laplace, transforms. PID controllers. Block diagram representation, Transient and frequency response, stability of closed loop system.Advanced control strategies. Computer based process control.
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