Heat Exchanger Designs
Calculations for heat exchanger designs use heat transfer parameters such as convection heat transfer coefficients, overall heat transfer coefficients, and log mean temperature differences. These calculations are needed for shell…
Non-Destructive testing (NDT)
NDT is the method of detection and measurement of properties or condition of materials, structures, machines without damaging or destroying their operational capabilities. Examples ofNDT are: magnetic dust method, penetrating liquid method, ultrasonic test and radiography. All NDTs are used to detect various types of flaws on the surface of material or internal inclusions of impurities and these techniques are also very useful during preventive maintenance and repair. There are few techniques which do not require any special apparatus and are quite simple to handle and only a moderate skill being required. Some of the applications of NDTs are detecting: (i) surface cracks (ii) material composition (iii) internal inclusions (iv) internal voids and discontinuities and (v) condition of internal stresses.
Gears for connecting intersecting shafts
Bevel gears are useful when the direction ofa shaft's rotation needs to be changed. They are usually mounted on shafts that are 90 degrees apart, but can be designed to work…
CAM Introduction
Cam - A mechanical device used to transmit motion to a follower by direct contact. Where Cam – driver member Follower - driven member. The cam and the follower have…
Contact Ratio (or) Number of Pairs of Teeth in Contact
To assure continuous smooth tooth action, as one pair of teeth ceases action a succeeding pair of teeth must already have come into engagement. It is desirable to have as…
Types of Welded Joints
There are five different types of welded joints for bringing two parts together for joining. Five types of welded joints are butt joint, corner joint, lap joint, tee-joint and edge joint. Tee…
Present State of Eddy Current Inspection
Eddy current inspection is used in a variety of industries to find defects and make measurements. One of the primary uses of eddy current testing is for defect detection when…
Comparison between Impulse and Reaction Steam Turbines
In Impulse Turbine, steam completely expands in the nozzle itself. Hence its pressure remains constant on both ends of the moving blades. In Reaction Turbine, Fixed blades act as nozzles.…
Velocity Ratio of Belt Drive
It is the ratio between the velocities of the driver and the follower or driven. It may be expressed, mathematically, as discussed below: Let d1 = Diameter of the driver, d2 =…
