MULTIPLE CHOICE 1.) Liquid movement due to surface forces = a. liquid diffusion b. vapor diffusion c. capillary flow d. hydrodynamic flow 2.) Vapor movement due to temperature difference a. hydrodynamic flow b. thermal diffusion c. liquid diffusion d. capillary flow
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MULTIPLE CHOICE
1.) Liquid movement due to surface forces =
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- 1) Identify the property of a fluid that can be identified only when the fluid is under motion. a. Surface tension b. Viscosity c. Capillarity d. Mass DensityGive operational definitions of the following terms: a) Specific gravity b) Vapour Pressure c) Dynamic viscosity d) Kinematic ViscosityTopic : Mixture Flow Problem A tank initially holds 100 gal of salt solution in which 50 Ib of salt has been dissolved. A pipe fills the tank with brine at the rate of 3 gpm, containing 2 lb of dissolved salt per gallon. Assuming that the mixture is kept uniform by stirring, a drain pipe draws out of the tank at 2pm. Find the amount of salt at the end of 30 minutes. Ans. 171.24 Ib
- Q1: Mass flow through a sonic nozzle is a function of gas pressure and temperature (Pressure = P, Temperature = T). If the mass flow rate through the nozzle is given by: m = 0.0430 70.5 Where: m Ib/min, P = Psia, T = °R a) Determine what the units for the constant 0.0430 are? b) What will be the new value of the constant, now gives as 0.0430, if the variables in the equation are to be substituted with SI units and m is calculated in SI units? Q2: Some of fermentation organism which is used to analyze the waste water from oil refinery can live at reduced air pressure down to 22 Kpa. In a test a mercury manometer attached to a tank reads 64.5 cmHg and the barometer reads 104 Kpa. Will the organize live at this conditions?Diffusion flux is directly proportional to the concentration gradient, according to Fick’s first law. Concentration gradient is________: A ) Rate of change of concentration with respect to distance B ) Rate of change of concentration with respect to time C ) Difference in concentrations at the source and sink D ) Ratio of concentrationsEstimate the original oil in place in barrels (OOIP) for oil reservoir has the following details as listed in the Table 1: Table 1: characteristics of oil reservoir Area of the reservoir 4500 acres-feet Thickness of the oil sand 47 ft Reservoir porosity 23% Water saturation 27% Reservoir Initial pressure 3250 psi
- 1- deforms the shape of fluid. 2- The physical variable is expressed quantitatively and can be measured by 3- The type of flow in which the fluid properties like velocity, density, pressure, ... etc, at a point do not change with time is called 4- When the fluid particles move in a zig-zag way and the eddies formation takes place this type of flow is called 5- In an through the rotor of the turbine and the pressure change occurs only in the nozzles.If the diameter of a circle is 10 cm, the area of the circle is m2. turbine, the pressure of liquid does not change while flowing 6- In an process, the temperature remains constant. 7- When the heat transfer into the system, it take the, sign. 8- The energy equation is for closed system state that Energy Supplied = 9- A 1kg/s of water inters a tube of 5 cm diameter. If the outlet radius is 10 cm, the mass flow rate at the outlet is 10- - transfer heat from low to high temperature stages by using mechanical work.A condenser is used to convert a gas into a liquid. The energy equation for a condenser is: Qcv = m(h₂ h₁) where 1 and 2 represent the state at the inlet and exit to the condenser (control volume). In addition to the steady state and steady flow assumptions, it has been assumed that: A) the change in kinetic energy is negligible OB) the change in potential energy is negligible OC) the net power input to the condenser is zero OD) all of the above, i.e. A), B) and C)choose true or fals then correct the mistakein each of the following 1. Bernoulli’s equation can be directly applied to viscous flow.a. Trueb. False 2. A chocolate bar is a good example of viscosity. a.Trueb. False 3.ALL liquids have the same viscosity.a. Trueb. False 4.A liquid with high viscosity will flow slowly.a. Trueb. False 5. Rays refract towards medium with high index of refractiona. Trueb. False
- 11/100 mm in size and 1100 kg/m3 in a cylindrical container with a diameter of 11 m density of 100 tons of activated carbon at 11 kPa absolute pressure and 477 °C It was fluidized using air at a high temperature. The viscosity of the air under these conditions is 0.018 cp given. According to this; a) Minimum gap fraction b) the minimum height of the fluidized bed, c) Minimum fluidization rate, d) Calculate the pressure loss of the fluidized bed at minimum conditions.Southern Technical University OETC STU Fluid Mechanic/Second Class Basra Technical Collage Thermal Mechanical Engineering Dep. Lecturer/ Farah A. Al-Salam H.W: what is the bulk modulus of elasticity of a liquid which is compressed in a cylinder from a volume 0.0125m' at 80N/cm2 pressure to a volume of 0.0124m' at 150N/cm2 pressure?Directions: Identify whether each statement is True or False. 1.When Dealing with liquids and gases, we ordinarily speak of stresses, for solids we speak pressures True False 2 .Open system is defined when a particular quantity of matter is under study. This system always contains the same matter. There can be no transfer of mass across it`s boundary True False 3. Thermodynamic properties can be placed in two general classes control volume and intensive True Flase 4. Triple point of water- is the condition of water temperature and pressure under which gaseous liquid and solid phases cannot exist in equilibrium True False 5. Intensive properties are additive in the sense previously considered. Their values are dependent of the size of extent of system and may vary from place to place within the system at any moment. Specific volume pressure. and temperature are important intensive properties True False