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4. Updated_Heat_Transfer_Presentation.pptx
- 1. Heat Conduction, Thermal Resistance, Overall Heat Transfer Coefficient, and Mass Transfer An Overview Presented by: Md. Helal Hossain Department: Mechanical Engineering, World University of Bangladesh
- 2. Heat Conduction Concepts • - Definition: Heat conduction is the transfer of thermal energy within a body due to temperature gradient. • - Fourier’s Law: q = -kA dT/dx • - q = Heat transfer rate (W) • - k = Thermal conductivity (W/m·K) • - A = Cross-sectional area (m²) • - dT/dx = Temperature gradient (K/m)
- 3. Thermal Resistance • - Definition: Opposition to heat flow through a material. • - Thermal Resistance Formula: • - Conduction: R_cond = L/kA • - L = Thickness of the material (m) • - Convection: R_conv = 1/hA • - h = Convective heat transfer coefficient (W/m²·K)
- 4. Overall Heat Transfer Coefficient • - Definition: Combined effect of conduction, convection, and radiation in heat transfer. • - Formula: • - 1/U = 1/hi + L/k + 1/ho • - U = Overall heat transfer coefficient (W/m²·K) • - hi and ho = Internal and external convective heat transfer coefficients
- 5. Mass Transfer • - Definition: Movement of mass from one location to another, often occurring in gases or liquids. • - Driving Forces: Concentration gradients, pressure gradients, temperature gradients. • - Modes of Mass Transfer: • - Diffusion: Movement from high to low concentration.
- 6. Applications and Examples • - Heat Conduction: • - Thermal insulation in buildings • - Cooling of electronic devices • - Thermal Resistance: • - Design of thermal insulators • - Heat sinks in electronics • - Overall Heat Transfer Coefficient: • - Designing efficient heat exchangers
- 7. Summary • - Key Concepts: • - Heat conduction is driven by temperature gradients. • - Thermal resistance is the opposition to heat flow. • - Overall heat transfer coefficient accounts for combined modes of heat transfer. • - Mass transfer involves movement due to
- 8. Q&A • - Questions and Discussion • - Encourage audience to ask questions and discuss real-world applications. • - Provide further explanations on complex topics as needed.
- 9. References • - Books and Articles: • - Incropera, F.P., DeWitt, D.P., "Fundamentals of Heat and Mass Transfer" • - Cengel, Y.A., "Heat and Mass Transfer: Fundamentals and Applications" • - Relevant research papers and articles
- 10. Heat Exchanger Design • - Definition: A device used to transfer heat between two or more fluids. • - Types of Heat Exchangers: • - Shell and Tube • - Plate • - Air Cooled • - Double Pipe • - Key Design Considerations:
- 11. Analysis of Heat Conduction • - Definition: Study of heat transfer through solid materials. • - Governing Equation: Fourier’s Law of Heat Conduction • - ( q = -kA _x000C_rac{dT}{dx} ) • - One-dimensional Heat Conduction: • - Steady-state: Temperature distribution does not change with time.