Engineering Thermofluids (GENG-1200-1) 6. A boundary layer is: a) A thin layer of fluid (b) A thin layer of fluid in contact with a solid surface that does not move due to fluid viscosity. c) A thin layer of fluid near the solid surface formed by relative motion between the fluid and surface. d) None of the above 7. Cavitation can be avoided by: a) Maintaining the local fluid pressure above the vapor pressure b) Maintaining the local fluid pressure below the vapor pressure (c)) Ensuring that the flow is turbulent. d) Maximizing the temperature of the fluid 8. An oil droplet with a diameter of 250 µm (Micrometer) and surface tension of 0.030 N/m experiences a AP of: a) 240 Pa b) 480 Pa c) 1.2 MPa d) 24 kPa 9. The Bernoulli equation is valid for: a) Steady, inviscid, and incompressible flow b) Compressible and incompressible flow c) Steady, viscous, and incompressible flow d) Steady, inviscid, and compressible flow 10. The fundamental difference between liquids and gases is: a) Liquids can vaporize while gases cannot exist in a liquid state. b) Liquids expand until they fully occupy their container while gases take the shape of their container. c) Liquids take the shape of their container while gases expand until they fully occupy their container. d) There is no major difference between liquids and solids. Page 13

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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.