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** HEAT TRANSFER**

Heat transfer can be defined as the study of the heat flow. In other words, it is the transition of heat or thermal energy from any object which is hotter to cooler object. It is basically concerned with the two things. First is temperature which represents amount of the thermal energy that is available & heat flow which is used to represent movement of the thermal energy from place to place. Basically, there is a main effect of heat transfer which causes the collision of the particles of one substance with the particles of any other substance.

There are three broad categories in which the mechanisms of heat transfer can be grouped. These are conduction, convection and radiation. In simple words, heat transfer can be done by convection, conduction or radiation. In the conduction, the heat is transferred through the solid objects. For example, heat transfer from outside of a house to inside of a house. In radiation, the heat comes out from a source of heat for warming a surface. For example, the sun which is shinning heating the furniture or floor via a window directly. In the convection, the heat is passed by the circulation of gases or liquids. For example, hot air in a room increases, drawing the cooler air from low.

Heat transfer mainly deals with the flow of heat in a system from hotter object to the cooler object. It refers to a form of energy which can be transfer from one zone to another due to the existence of difference in temperature.

Heat transfer mainly deals with two things i.e. heat flow and temperature. Transfer of heat can be slowed but can never be terminated. Heat transfer can be divided into two types which are listed below:

1. Steady-state heat transfer: in this, the aggregate of heat transfer will be same with the passage of time. Formulae of steady-state heat transfer is T=f v(x,y,z).

2. Unsteady-state heat transfer: in this, the aggregate of the heat transfer can be change with the passage of time. Formulae of unsteady-state heat transfer is T= f (x,y,z;t).

The Stefan-Boltzmann law determines that whole radiation which is released by the black body is equivalent to the fourth power of its absolute temperature. It can be represented as E = σT^{4}, whereas E refers to the radiant heat energy and T denoted for absolute temperature. Further, Stefan-Boltzmann constant can be defined as a constant which is directly proportional to its law.

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Questions;

Identify the important and/or possible heat transfer modes in any physical system.

Write surface and control volume energy balances with the appropriate heat transfer rate equations for any physical system.

Simplify the general heat conduction equation and write boundary conditions for any well-posed conduction heat transfer problem.

Represent any steady-state, 1-D conduction system as a thermal circuit and solve for unknown heat rates and/or temperatures.

Use the lumped capacitance method or appropriate analytical solution to solve transient conduction problems.

Calculate a convection heat transfer coefficient (h) from an appropriate empirical correlation and use it to determine a heat transfer for a variety of fluid flow configurations.

Design/specify a fin array or heat sink to meet a temperature or heat rate requirement.

Calculate pressure drop, fluid outlet temperatures, heat transfer rate, or required surface area for pipe flows and heat exchangers.

Determine view factors, compute radiation heat rates and/or temperatures in an n-sided enclosure with gray, diffuse surfaces.

Introduction to heat transfer, modes of heat transfer, control volume energy balances, general conduction equation, thermophysical properties, one dimensional steady analytical solutions, electrical analogy, dimensionless groups.

Extended surfaces, numerical methods for steady conduction, transient conduction.

Internal and external single phase forced convection.

Convective energy equation, scaling analysis and dimensionless groups.

Calculation of heat transfer coefficients analytically and with correlations.

Free convection, film condensation, and nucleate boiling.

Heat exchangers.

Combined mode analysis

Radiation physics and properties, spectral and directional effects,

shape factors and energy exchange between surfaces

Introduction to Thermodynamics ,Heat Conduction Equation ,Steady Heat Conduction ,Transient Heat Conduction

Fundamentals of Convection ,External Forced Convection ,Internal Forced Convection ,Natural Convection

Boiling and Condensation ,Heat Exchangers ,Fundamentals of Thermal Radiation

Radiation Heat Transfer ,Heat Exchangers

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**HEAT TRANSFER**

Introduction to fundamentals of heat transfer., conduction, forced and free convection, mixed modes , heat exchangers, , radiationDevelopment and use of analytic and empirical expressions in terms of dimensionless parameters.

**HEAT TRANSFER ANALYSIS**

A foundation for thermal analysis is developed in terms of the physical modes of heat transfer and the formulation of math models. , Theory of heat conduction, single-phase forced and natural convection, phase-change convection, radiation and modern applications including microelectronics, biothermal and microscale processes are addressed.

**Heat Transfer**

**under three conditions:**

- Fully Submerged
- 50% Submerged
- Completely exposed to air

**Figure 1: Heated water bath details**

**Additional data**

**Report formatting**

**Heat Transfer**

- Steady and unsteady conduction, Numerical analysis of conduction, Natural and forced convection, Introduction to boiling, condensation and evaporation, Radiant heat exchange, Introduction to conduction. , One-dimensional steady-state conduction.
- Transient conduction, Introduction to convection , External flow , Exclude the derivation of Equations , Internal flow , Free convection , Heat exchangers , Radiation , Convection , forced convection correlations for internal & external flow , free convection correlations.
- boiling and condensation equations, Radiation , the blackbody, radiative surface properties, Kirchhoff’s law, view factors, radiation network diagrams, radiation exchange between surfaces, radiation shields

**Heat Transfer**

- Introduction to heat transfer by the mechanisms of conduction
- Convection and radiation
- Heat transfer by conduction
- Radiation
- Convection
- Elementary heat exchanger design
- Mechanisms
- Theory heat transfer
- Applications
- Conduction
- Convection radiation
- INTRODUCTION: rates of energy transfer,modes of heat transfer
- CONDUCTION: rate equation, boundary and initial conditions, thermal properties

ONE-DIMENSIONAL, STEADY-STATE CONDUCTION: plane wall, cylinder and sphere, composite walls, equivalent thermal circuits, Conduction with internal heat generation, Extended surfaces (fins) - TWO-DIMENSIONAL, STEADY-STATE CONDUCTION: Numerical steady-state heat transfer
- TRANSIENT (UNSTEADY) CONDUCTION: Lumped capacitance, Spatial effects, Plane wall, radial systems with convection, Semi-infinite solid, Multi-dimensional systems, Numerical transient heat transfer.
- CONVECTION: Boundary layers, laminar and turbulent flow, convection transfer equations, approximations, Similarity, integral method, dimensionless parameters, analogies, turbulence
- EXTERNAL FLOWS: Flat plate, cylinder, sphere, tube banks, packed beds.
- INTERNAL FLOWS, Hydrodynamic and thermal considerations, energy balance, correlations
- FREE CONVECTION: Physical phenomena, equations, similarity, laminar and turbulent flows, Empirical correlations, free and enclosed flows.
- HEAT EXCHANGERS: Review of Convection
- RADIATION: Concepts Intensity, blackbody radiation, Surface emission, absorption, Kirchoff's law, gray surface, environmental radiation
- RADIATION EXCHANGE BETWEEN SURFACES: View or shape factor, blackbody radiation exchange, Radiation exchange between gray surfaces, Radiation network method

Newton’s law of cooling

Stefan-boltzmann law

Conservation of energy

Heat flux

Boundary conditions

Initial conditions

One-dimensional steady-state conduction with and without heat generation

Heat transfer from extended surfaces

Two,three dimensional steady-state conduction

Numerical solutions

Transient conduction

Lumped capacitance method

Semi-infinite media

Fundamentals of thermal radiation

Black surfaces

Gray surfaces

Surface properties

View factor

Radiative exchange among black surfaces

Diffuse gray surfaces

Electric analogs

Radiation shields

Fundamentals of convection

Conservation of energy

Thermal boundary layers

Dimensionless parameters

Momentum transfer analogies

Heat,mass transfer analogies

Forced convection external flows

Similarity parameters

Laminar and turbulent boundary layers on flat surfaces

Heat transfer to cylinders,spheres, tube banks, packed beds, impinging jets

Forced convection internal flows

Laminar flow through circular and noncircular ducts

Turbulent flow through circular and noncircular ducts

Developed flow

Hydrodynamically

Thermally developing flows

Empirical correlations

Free convection boundary layer equations

Laminar boundary layers on flat surfaces

Turbulence

Empirical

Correlations

Heat exchangers

Overall heat transfer coefficient

Cocurrent flow

Countercurrent flow

Cross flow

Effectiveness-ntu method

Condensers

Evaporators

Compact heat exchangers

One- and Two-dimensional conduction in Cartesian coordinates

1-D conduction, Fin heat transfer

Heat Convection:

Newton’s law of cooling

Nusselt number

Heat Exchanger Analysis:

Heat transfer coefficient

Heat exchangers

Thermal Radiation

Kirchoff’s Law