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 ).
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Assembly Drawings & Development Of Solids And Sectioned Solids

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Assembly Drawings:


It is drawing of machine with all of its components located and identified.

Image result for bill of materials engineering drawing

Ballooning:

In Assembly Drawing, a part is located and identified by using a circle containing the part number and a leader line that points to the corresponding part.
Image result for ballooning in assembly drawing in engineering drawing

Development Of Solids & Sectioned Solids 

Development Of Solids:

A graphical method of obtaining an area of the surfaces of a solid is termed as Development Of Solids OR It is the unfold/ unrolled /plane figure of a 3-D object.

For Example:

     1. When a solid is opened out and its complete surface is laid on a plane, the surface of the solid is said to be developed.

     2. A piece of paper having the shape of sector is rolled so that its extreme edges meet, we get a cone.
     3. A rectangle sheet when rolled so that extreme edges meet, we get a cylinder.

Types Of Development Of Solids:

There are two types of Development of Solids, namely:
  1. Parallel-Line Development.
  2. Radial-Line Development.

1.  Parallel-Line Development:


Two parallel lines are drawn from the two ends of the solids and the lateral faces are located between the lines. This method is used for the development of Prisms and Cylinders.

Image result for parallel line development

2.  Radial-Line Development:

 An arc of radius equal to the slant edge and generator is drawn and the lateral and curved faces are marked through radial lines, inside the arc, with vertex as their origin.
Image result for radial line development

References:

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