Mechanical Engineering :: Heat and Mass Transfer
- Thermal conductivity of air with rise in temperature
- Thermal conductivity of water in general with rise in temperature
- The thermal diffusivities for gases are generally
- Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be
- Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)
- An ordinary passenger aircraft requires a cooling system of capacity.
- A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is
- Moisture would find its way into insulation by vapour pressure unless it is prevented by
- The ratio of surface convection resistance to the internal conduction resistance is known as
Whatsapp
Facebook
