Radiation Heat Transfer

-
Image
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 ).
Post a Comment

Moment of Inertia

-

Moment of Inertia:

It is defined as;
The resistance to bending or change in its rotation.

It is also called 2nd Moment of Inertia.




The formula for the Moment of Inertia is given by:



Parallel-Axis Theorem For an Area:

It can be used to find the moment of inertia of an area about any axis that is parallel to an axis passing through the centroid and about which the moment of inertia is known.


From the definition of Moment of Inertia:


  • The first integral represents the MOI of an area about the centroidal axis Ix.
  • Second integral (a mathematical quantity) is zero since the X` axis passes through the centroid C itself.
  • The third integral represents the total area A.


Radius of Gyration of an Area:

(Gyration: A rapid movement in a circle or spiral).

Radius of Gyration is defined as;
Distance from a given axis upto a point where the entire area is assumed to be concentrated.
It is a quantity use for the design of columns in Structural Mechanics.


Moment of Inertia for Composite Areas:

A composite area consists of a series of connected simpler shaped Bodies. The MOI of these bodies about any axis is equal to the algebraic sum of the moments of inertia of all its parts.


Product of Inertia for an Area:

Product of Inertia is used to determined the maximum and minimum values of MOI which are important for Designing structural and mechanical members such as beams, columns, shafts, etc.

References:

Comments

  1. AnonymousJanuary 11, 2020 at 9:25 AM

    You can get material about Engineering Statics from youtube channel https://www.youtube.com/playlist?list=PLLbvVfERDon1pceRKOjAxiqFTEvghmZKh
    This will make you understand the basic concepts related to Statics and you can match it with the standard syllabus with this blog

    ReplyDelete

Post a Comment

HI, we wI'll contact you later

Popular posts from this blog

Corrections Of Tape

-
Image
TAPING CORRECTIONS There are two types of corrections depending upon the type of errors in tape due to the different conditions.  1. Systematic Errors : Slope Erroneous tape length Temperature Tension Sag 2. Random Errors : Slope  Alignment Marking & Plumbing Temperature Tension & Sag 1. Temperature Correction  It is necessary to apply this correction, since the length of a tape is increased as its temperature is raised, and consequently, the measured distance is too small.  It is given by the formula,                         C t  = 𝛼 (T m  – T o )L Where,   C t  = the correction for temperature, in m.      𝛼 = the coefficient of thermal expansion.    T m  = the mean temperature during measurement.          T o  = the temperature at which the tape is standardized.       L = the measure length in m. For Foot Unit :                          C t  = 6.45×10^-6  (T m  – 68 )L For Metric Unit :                          C t  = 1.16
Read more

Orthographic Projections

-
Image
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 plan
Read more

Introduction to Survey

-
Image
ENGINEERING SURVEY Surveying is the science, art and technology of determine the relative positions of points above, on or beneath the Earth's surface so as to construct a map, plan or description. TYPES OF SURVEY : There are many types of survey but we discuss some of them.  1. Plane & Geodatic Survey : Ordinary field and topographical surveying in which the Curvature of Earth's surface is disregarded is called Plane Survey. It is performed when the area is smaller than 250sq.km.  A survey of a large land area in which corrections are made for the Curvature of Earth's surface is called Geodatic survey.  Why Geodatic Survey is important? Earth's surface is not flat, it is sphere. So all the calculations which were made by considering the Earth's surface flat are incorrect. So a new type of survey came into play which made calculations on the basis of geodatic condition of Earth's surface.  2. Topographic Survey : Topographic surv
Read more