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Quiz

Bernouilli equation

Théo Rizzo 8 Fragen

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Fragen in diesem Quiz (8)

  1. 1The Bernouilli equation is
    1. Aapplicable for steady flows
    2. Bapplicable in presence of components that disturb the streamlined structure of the flow
    3. Capplicable in presence of pumps, turbines, impellers...
    4. Dvalid for constant density fluid
    5. Ecan be applied along a streamline
  2. 2The Bernouilli equation
    1. ACan be used to measure the cruise velocity of a flying plane
    2. BCan be used to determine the time needed to empty a large tank
    3. CCannot be used to predict evaporation in a liquid due to pressure drops
    4. DCannot be generalized to include the effect of friction forces
    5. ECan be applied in the case of non-uniform velocity fields
    6. FCan be extended to include the effect of pumps and turbines
  3. 3The Bernouilli equation states that the sum of the kinetic and potential energies of a fluid particle is constant along a streamline, during steady flow when the compressibility and frictional effects are negligible
    1. ARichtig
    2. BFalsch
  4. 4The total pressure is the sum of dynamic, hydrostatic and thermodynamic pressure
    1. ARichtig
    2. BFalsch
  5. 5The pressure drops
    1. ADepend on a friction coefficient, which changes in laminar and turbulent regime
    2. BDepend linearly on the velocity in turbulent regime
    3. CDepend linearly on the velocity in laminar regime
    4. DConsist of distributed and concentrated pressure drops
    5. EDepend on a friction coefficient, whose expression is the same for distributed and concentrated pressure losses
  6. 6In turbulent flow, the shear stress
    1. AIs the sum of a laminar and a turbulent component
    2. BCan be simply obtained by replacing the local velocity by the mean velocity
    3. Cis larger than in laminar flow
    4. DCan be related to the diffusive flux of momentum associated to the fluctuating velocity component
    5. ECan be expressed in analogy to the laminar shear stress, introducing a fluid property called turbulent viscosity
  7. 7The velocity profile in a turbulent flow
    1. AIs parabolic as in a laminar flow
    2. BIs characterized by a flat core region, with a sharp drop at the wall
    3. CConsists of 3 regions, viscous, inertial and turbulent layers
    4. DConsists of 4 regions, viscous, buffer, inertial and turbulent layers
    5. EIs linear close to the wall, du to the dominant viscous effects
  8. 8The boundary layer thickness
    1. AGrows with x^0.5, while the relative thickness of the boundary layer decreases with Re^0.5.
    2. Bcan be estimated using a unique approach
    3. Ccan be determined using approaches of increasing complexity, force balance, integral method and Blasius solution
    4. Dcan be determined using the integral method postulating a cubic velocity profile

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Beschreibung
Fluid mechanics Quiz am Bernouilli equation, erstellt von Théo Rizzo am 04/01/2022.
Sprache
English
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Schlagwörter
fluid mechanics
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