**Process Heat Transfer**

**Paper Code: CHE 502**

**Module I****Heat Transfer by Conduction:**

Classification of different Modes; Concept of heat diffusion (conduction), Fourier’s Law; Thermal Conductivity – constant and variable; Thermal Diffusivity; Steady State Conduction – Rectangular (Cartesian), Cylindrical and Spherical coordinates; Compound Resistance in Series; Critical thickness of insulation, One dimensional unsteady state heat

conduction, Lumped system analysis, Slab – use of transient temperature chart.

**Module II****Heat Transfer by Convection:**

Concept of convection, General Heat Transfer Equation (Convection-Diffusion), Flow over a body – Hydrodynamic boundary layer, Drag coefficient, Drag force, Thermal boundary layer, Heat Transfer coefficient. Flow inside duct – Thermal boundary layer, Heat Transfer coefficient.

Heat Transfer in Turbulent Region: Dittus-Boelter Equation; Correction for temperature variation over pipe cross section; Physical Interpretation of different Dimensionless groups; Reynolds analogy, Colburn Analogy; Wilson Equation; Natural Convection; Correction of Laminar flow equation for Natural Convection.

**Module III****Heat Transfer of Fluids with Phase Change:**

Introduction; Dropwise and Film-Type Condensation; Coefficients for Film-Type Condensation: Nusselt Equation for Vertical and Horizontal Tubes; Condensation of Superheated Vapors; Heat Transfer to Boiling Liquids: Pool boiling of Saturated Liquid; Film Boiling.

**Radiation Heat transfer:**

Introduction; Monochromatic emissive power; Weins displacement law; Plank’s law of radiation; Kirchoff,s Law; Emissivity of Solids; Absorption of Radiation; Lambert-Beer’s law; Absorption by gases. Radiation between surfaces, Concept of View Factor.

**Module IV****Heat Exchange Equipments:**

Typical Heat Exchange Equipment; Parallel Flow, Countercurrent Flow, and Cross Flow; General Design of Heat- Exchange Equipment; Different types of Heat Exchanger: Double Pipe Heat; Shell and Tube (1-1, 1-2, 2-4); Introduction to Plate Type; Condensers: Shell and Tube;

**Evaporation:**

Introduction; Liquid Characteristics; Types of Evaporator; Performance of tubular evaporator: Capacity, Steam economy; Boiling Point Elevation (Dühring Rule); Outside Heat Transfer Coefficients; Enthalpy Balance for a Single Effect Evaporator; Introduction to Multiple Effect Evaporator: Forward feed, Backward feed, Mixed feed, Parallel feed; Design

concept of Multiple Effect Evaporator.

**Text Books:**

- Heat Transfer – A Basic Approach: M. Necati Ozisik, McGraw-Hill International Edition, Singapore (1985)
- Fundamentals of Heat and Mass Transfer: Frank. P. Incropera and David. P. Dewitt, Wiley, 4th Ed.
- Units Operations of Chemical Engineering: McCabe & Smith and Harriot, MGH, 5th Edn.
- Heat Transfer, B. K. Dutta, PHI
- Process Heat Transfer: D. C. Kern : MGH.
- Heat Transfer,Long,Pearson Education

**References:**

- Coulson & Richardson: Chemical Engineering (IV)
- Process Heat Transfer: Y.V.C. Rao