Since Biot number is the ratio of conduction resistance to convection resistance and in lumped heat analysis convection resistance ≫ conduction resistance, it means that conduction resistance of solid is negligible as compared to convection resistance of fluid.
E = 2G(1 + μ) ...(i) E = 3K (1 - 2μ) ...(ii) In this cae there are four unknown quantities and only two equation are available. Hence any two of the four unknown quantities must be known for complete stress relationship.
LaMont, Benson and Veiox are high pressure boilers which use in external pump to force wate or steam through the boiler circuit independen of natural circulation due to static head anc convection currents.
• The we friction is about one-third of dry friction clutch. • The torque capacity of dry clutch is more as compared with the torque capacity of wet clutch of the same dimensions. • In wet clutches, the lubricating oil carries away the frictional heat.
The snap heads are usually employed for structural work and machine riveting. The counter sunk heads are mainly used for ship building where flat surfaces are necessary. The conical heads (also known as conidal heads) are mainly used in case of hand hammering. The pan heads have maximum strength, but these are difficult to shape.