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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Orthographic Projections
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Projection:
The term Projection is defined as:
Presentation of an image or an object on a surface.
The principles used to graphically represent 3-D objects and structures on 2-D media and it based on two variables:
Line of Sight.
Plane of Projection.
Line of Sight & Plane of Projection:
Line of sight is divided into 2 types:
Parallel Projection
Converging Projection
&
A plane of projection is an imaginary flat plane upon which the image created by the lines of sight is projected.
Orthographic Projection:
When the projectors are parallel to each other and perpendicular to the plane of projection.
The lines pf sight of the observer create a view on the screen.
The screen is referred to as the Plane of Projection (POP).
The lines of sight are called Projection lines or projectors.
Rules of Orthographic Projection:
Edges that are parallel to a plane of projection appear as lines.
Edges that are inclined to a plane of projection appear as foreshortened lines.
Curved edges project as straight lines on the plane of projection to which they are perpendicular.
Curved edges project as curved lines on the planes to which they are parallel or inclined.
Normal surfaces appear as an edge in two opposite principal views, and appear as surface in all other principal views.
Inclined surfaces appear as an edge in two opposite principal views, and appear foreshortened in all other principal views.
Six Principal Views of Orthographic Projection:
Six principal view of orthographic projection are:
How We Draw Views Of Orthographic Projection:
The figure shows how we draw views of orthographic projection and co-relate them with each other.
How We Choose The Front View:
It is the most important step taken when you start to draw views of Orthographic Projections. You should follow guidelines to get your path correct.
Front view should have minimum hidden lines.
The view should be stable.
Most basic profile should be used.
Types Of Projections:
There are two types of projections, namely:
First Angle Projection
Third Angle Projection
1. First Angle Projection:
2. Third Angle Projection:
Symbols Of Angles of Projections:
You should draw these symbols if you are going to draw views of Orthographic Projection.
Angles & Directions Angles are also called bearings. Bearings are the acute angles between lines and meridians. They are divided into following types. Related Terms : Meridian : Imaginary line joining North and South poles. Declination : Difference between magnetic and true meridians. Azimuth : Clockwise angle taken from Geodatic North. * If area is greater ➤ use Geodatic North * If area is smaller ➤ use Magnetic North Magnetic Declination maybe towards East or West. For east ➤ Magnetic bearing=true bearing - Declination For west ➤ Magnetic bearing=true bearing + Declination Forward Bearing : Bearing taken in the direction of traverse. Backward Bearing : Bearing taken in opposite direction of traverse. Forward bearing - Backward bearing=180 For anti-clockwise : FB of line = BB of previous line + angle Example: In an anti-clockwise traverse <A=102'30',...
Center of Gravity: It is defined as; The resultant weight of a system which passes through a single point is called Center of Gravity ( G ). Center of Mass: It is defined as; The point at which the whole mass of the system acts. The concept of center of mass is cleared from the video given below: Centroid of a Volume: Objects having three dimensions have the centroid which is its geometric centre. Centroid of an Area: Objects having two dimensions have the centroid which is its geometric centre. Centroid of a Line: Objects having linear dimensions have the centroid which is its geometric centre. Composite Bodies: A composite body consists of a series of connected simpler shaped Bodies which may be rectangular, triangular, semicircular, etc. References: www.youtube.com www.wikipedia.com http://web.aeromech.usyd.edu.au/statics/doc/friction/Friction1.htm From Book Engineering Mechanics sta...
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