Heat Transfer & Thermal Machines | Convection Heat Transfer by Pavan | Learn Smarter
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Convection Heat Transfer

Convection heat transfer involves the interaction of conduction and fluid motion, governed by equations like the continuity and Navier-Stokes momentum equations. The chapter covers boundary layers, forced and free convection, dimensionless parameters, and correlations for heat transfer in both internal and external flows. Techniques for estimating heat transfer rates and approximate solutions for laminar boundary layers are also discussed.

Sections

  • 1

    Basic Equations Of Convection

    This section discusses the basic equations governing convection, including the principles of conduction, advection, and the associated boundary layers.

    Learning Practice

  • 2

    Boundary Layers

    This section covers boundary layers, which are crucial for understanding convection heat transfer within fluids, specifically focusing on hydrodynamic and thermal boundary layers.

    Learning Practice

  • 2.1

    Hydrodynamic Boundary Layer

    The hydrodynamic boundary layer is a crucial concept in fluid mechanics where the fluid's velocity transitions from zero at the wall to the free stream value.

    Learning Practice

  • 2.2

    Thermal Boundary Layer

    The thermal boundary layer is a critical area in fluid mechanics where the temperature changes from the wall temperature to the free stream temperature.

    Learning Practice

  • 3

    Forced Convection

    Forced convection involves fluid motion driven externally, enabling efficient heat transfer in various systems.

    Learning Practice

  • 3.1

    External Flow

    This section discusses the principles of external flow in convection heat transfer, highlighting concepts like boundary layers, forced convection, and the governing dimensionless numbers.

    Learning Practice

  • 3.2

    Internal Flow

    This section focuses on convection heat transfer, detailing essential governing equations, boundary layers, forced and natural convection, dimensionless parameters, and heat transfer correlations.

    Learning Practice

  • 4

    Natural (Free) Convection

    Natural convection involves fluid motion driven by buoyancy due to temperature gradients, playing a crucial role in various thermal applications.

    Learning Practice

  • 5

    Dimensionless Parameters

    The section discusses various dimensionless numbers that govern fluid behavior in convection heat transfer, essential for understanding flow regimes and heat transfer coefficients.

    Learning Practice

  • 6

    Correlations For Forced And Free Convection

    This section covers the correlation equations for both forced and free convection heat transfer, outlining how dimensionless numbers affect heat transfer coefficients for various flow conditions.

    Learning Practice

  • 6.1

    Forced Convection (External Flow)

    This section introduces forced convection, detailing its mechanisms, applications, and relevant governing equations.

    Learning Practice

  • 6.2

    Forced Convection (Internal Flow)

    This section covers forced convection, focusing on internal flow and governing equations pertinent to engineering applications.

    Learning Practice

  • 6.3

    Free Convection (Vertical Plate, Laminar)

    This section discusses free convection over vertical plates in laminar flow, highlighting the governing equations and the significance of the Nusselt number in this context.

    Learning Practice

  • 6.4

    Free Convection (Vertical Plate, Turbulent)

    This section discusses free convection on vertical plates in turbulent flow, focusing on the governing principles and heat transfer correlations.

    Learning Practice

  • 7

    Approximate Solutions For Laminar Boundary Layers

    This section presents approximate analytical methods for solving laminar boundary layers, focusing on the Pohlhausen method and integral methods like the Von Kármán–Pohlhausen approach.

    Learning Practice

  • 8

    Estimating Heat Transfer Rates

    This section discusses methods for estimating heat transfer rates in convection using correlations and Nusselt number equations.

    Learning Practice

References

Module III_ Convection Heat Transfer.pdf

Class Notes

Memorization

What we have learnt

  • Convection heat transfer is...
  • The behavior of fluid flow ...
  • Dimensionless numbers like ...

Final Test

Revision Tests