PTT361 Quiz 3: Lecture 4.1

What are the two concepts that are discussed in Lecture 4.1?

• Partial similarity

• Reduction of pi-set

• Intermediate quantities

• Scale invariance

Select the correct description to an "appropriate" model in scale up:

• To conduct model measurements in more than one model device, the numerical values of the pi-numbers must be the same with the selection of the numerical values of the process parameters of the model material system.

• To conduct model measurements in only one model device, the numerical values of the pi-numbers must be the same with the selection of the numerical values of the process parameters of the model material system.

• To conduct model measurements in only one model device, the numerical values of the pi-numbers must be adjusted by appropriate selection of the numerical values of the process parameters of the model material system.

• To conduct model measurements in more than one model device, the numerical values of the pi-numbers must be adjusted by appropriate selection of the numerical values of the process parameters of the model material system.

In another words, in scale up, we should: use the ________ model only and choose the suitable numerical values to be plucked into the model, especially the process and material parameters.

Which of the following quantities or parameters that could be changed when investigating the appropriate model in Step 6?

• Process

• Target

• Material

• Geometric

Which of the following quantities or parameters that should be changed when investigating the appropriate model in Step 6 if the model material system is unavailable?

• Target

• Process

• Material

• Geometric

Sometimes we just can't conduct model measurement in only one model device, but why?

Which of the following parameters are unmeasurable according to the Example 3.3 in Lecture 4.1?

• Densities of the foam

• Dynamic viscosity of the foam

• Elasticity of the foam

• Concentration of the surfactant

Define: Partial Similarity

• To divide the process of study into parts and investigate them separately

• To deliberately abandon certain similar criteria and their effect on the entire process

• To divide the process of study into parts and investigate them altogether

• To deliberately abandon certain different criteria and their effect on the entire process

When we don't have an appropriate model appliance, why should be we opt of the scale up using partial similarity?

• It's cheaper to do so

• It's more expensivero do so

• It's harder to do so

• It's more challenging to do so

Which of the following famous dimensionless numbers are related to the Example 3.4 in Lecture 4.1?

• Reynolds number

• Froude number

• Arrhenius number

• Arthur number