Radiation Heat Transfer

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View Factor Orientation (or View factor or shape factor) plays an important role in radiation heat transfer. View factor is defined as, "fraction of radiation leaving surface 'i' and strike 'j' ". Summation Rule (View Factor) If there is are similar surfaces 'i' and 'j' , then: Blackbody Radiation Exchange Radiation Exchange between Opaque, Diffuse, Gray surfaces in an Enclosure 1. Opaque 2. Surfaces 3. Two surface enclosure Radiation Shield It is used to protect surfaces from radiation act like a reflective surface. References: Material from Class Lectures + Book named Fundamentals of Heat and Mass Transfer by Theodore L. Bergman + My knowledge.  Photoshoped pics  are developed.  Some pics and GIF from Google.   Videos from YouTube ( Engineering Sights ).

Introduction to Statics


Statics:


It is the branch of physics which deals with the analysis of load on physical systems which they are at rest.

Some topics related to Statics:

》 Space:

Space is a boundless, 3 dimensional extent in which objects and events occur and havery relative position and direction.

》 Time:

Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of object.

》 Mass:

It refers to the properties of matter which is equivalent to inertial mass, active gravitational mass and passive gravitational mass.

》 Force:

It is an influence which can change the state of rest or motion of an object.

》 Particle:

A particle is a small localized object having mass and volume.

》 Rigid Bodies:


Bodies which don't deform under load are called Rigid Bodies. It is the only supposition in Statics.

Types of Forces:


There are three types of forces, namely;
1. External Force.
2. Internal Force.
3. Constraint Force.
And, they are further divided as:

Causes of Force:


There are many causes of force which are as follows:
1. Constact Force 
2. Friction 
3. Gravitation
4. Electrostatics or magnetism, etc

Force Measuring Instruments:


Force can be measured by using :
1. Spring Balance
2. Load Cells ( high accuracy, measure weight with electric signals ), etc.

System of Forces:




There are three systems of forces, which are as follows:

1. Coplanar force system:


It is defined as;
Forces which are acting in same plane.

2. Collinear force system:


It is defined as;
Forces which are acting on the same line of action (axis).

3. Concurrent force system:


It is defined as;
Forces acting on the same point.

Principle of Transmissibility:


A force may be applied at any point in its given line of action without altering the resultant effects of the force external to the rigid body on which it acts.

References:

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