Heat Transfer Through Fins

Tuesday, 28 March 2017 by

Convection heat transfer between a hot solid surface and the surrounding colder fluid is governed by the Newton’s cooling law which states that “the rate of convection heat transfer is directly proportional to the temperature difference between the hot surface and the surrounding fluid and is also directly proportional to the area of contact or

Due to molecular attraction, liquids possess certain properties such as cohesion and adhesion. Cohesion means inter-molecular attraction between molecules of the same liquid. Adhesion means attraction between the molecules of a liquid and the molecules of a solid boundary surface in contact with the liquid. The property of cohesion enables a liquid to resist to

Fluid Properties

Monday, 20 March 2017 by

A fluid is a substance which is capable of flowing or deforming under the action of shear force (however the small force may be). Examples: liquids, gases and vapors.

Heat Exchangers

Monday, 20 March 2017 by

Heat Exchanger is an adiabatic steady flow device in which two flowing fluids exchange or transfer heat between themselves due to a temperature difference without losing or gaining any heat from the ambient atmosphere.

Transient heat conduction

Monday, 20 March 2017 by

Generally, the temperature of a body varies with time as well as position. In heat conduction under steady conditions, the temperature of a body at any point does not change with time. Thus, it can be concluded that this type of heat conduction is a function of position only. In heat conduction under unsteady state

Theories of failure

Monday, 20 March 2017 by

Theories of failure are those theories which help us to determine the safe dimensions of a machine component when it is subjected to combined stresses due to various loads acting on it during its functionality.

Bernoulli’s Equation

Saturday, 25 February 2017 by

A fluid in motion is subjected to various forces which results in variation of the acceleration and the energies involved in the flow phenomenon of the fluid. The study and analysis of the fluid flow by considering forces and energies involved is known as fluid dynamics. Similar to mechanics of solids, the dynamics of fluid

Strain gauge and rosettes

Friday, 24 February 2017 by

A strain gauge is a device which is used to measure strain (deformation) on an object subjected to forces. Strain can be measured using various types of devices classified depending upon their principle of operation. Some of them are as follows: 1. Mechanical type, 2. Optical type 3. Pneumatic type 4. Electrical type

Ultrasonic Machining

Thursday, 23 February 2017 by

Ultrasonic Machining is a mechanical type of non-traditional machining process. It is employed to machine hard and/or brittle materials (both electrically conductive and non-conductive) having hardness usually greater than 40RC (Hardness on Rockwell scale-C). It uses a shaped tool, high frequency mechanical motion and slurry.

Thin Cylinders

Tuesday, 21 February 2017 by

When the thickness of the wall of the cylinder is less than 1 10 to 1 15 of the diameter of cylinder then the cylinder is considered as thin cylinder. Otherwise it is termed as thick cylinder.