Chapter 3( Convection)

Conduction and convection are similar in that both mechanisms require the presence of a material medium.But they are different in that convection requires ?

• The presence of fluid heat

• The presence of fluid motion

• The presence of different fluid

• The presence of fluid love

Which statement is FALSE?

• Convection heat transfer strongly depends on the fluid properties

• It also depends on the geometry and the roughness of the solid surface.

• The rate of convection heat transfer is observed to be INVERSELY proportional to the temperature difference

• •The convection heat transfer coefficient h depends on the several of the mentioned variables, and thus is difficult to determine.

What is this equation?

• Nusselt Number

• Reynold Number

• Prandtl Number

• Phone Number

What is this equation?

• Nusselt Number

• Reynold Number

• Prandtl Number

• Plate Number

EXTERNAL Flow Over Flat Plates In engineering analysis, a generally accepted value for the critical Reynolds number is_______ before flow turn into TURBULENT

• Re _xcr > 5 x 10⁶

• Re _xcr > 6 x 10⁶

• Re _xcr > 6 x 10⁵

• Re _xcr > 5 x 10⁵

This case study refer to constant surface temperature at local Nusselt Number.

• TRUE

• FALSE

What is Region A?

• Thermal fully developed region

• Thermally entrance region

• Hydrodynamic fully developed region

• Hydrodynamic entrance region

What is Region B?

• Thermal fully developed region

• Thermally entrance region

• Hydrodynamic fully developed region

• Hydrodynamic entrance region

What is Area 1?

• Boundary layer region

• Irrotational (core) flow region

• Fully developed flow

• Center Layer

What is Area B?

• Boundary layer region

• Irrotational (core) flow region

• Fully developed flow

• Side Layer