Hydraulic Characteristics of Channels Quiz

Play an AI-generated podcast conversation about this lesson

What is the definition of 'two-phase flow'?

A mixture of fluid and steam coexisting in a flow, both in gaseous form

A mixture of fluid and steam coexisting in a flow, in different forms like bubbles or droplets (correct)

A flow where one phase is condensate and the other phase is dry steam

A flow where one phase is saturated water and the other phase is superheated steam

How are two-phase flows classified based on the character of the mutual phase flow?

By the intensity of interaction

By the flow pattern (correct)

By the relative disposition of phases

By the time character of the processes

Which type of two-phase flow is characterized by a flow pattern consisting of small, distinct packets of one phase in continuous flow of another phase?

Dispersed-annular flow

Homogeneous model

Dispersed flow

Slug flow (correct)

In two-phase flows, what does 'non-equilibrium' refer to?

Flow with phases far from reaching equilibrium Signup and view all the answers

What distinguishes 'stationary' two-phase flows from 'non-stationary'?

Stationary flows have constant flow rates, while non-stationary flows have changing rates Signup and view all the answers

What is the purpose of the Na3PO4 additive in water cleansing?

To form non-adhesive slag Signup and view all the answers

Which corrective additives are commonly used in water treatment to suppress oxygen and carbon dioxide?

Hydrazine and ammonia Signup and view all the answers

What is the impact of low hardness in feed water on the Water Cleansing Regime (WCR)?

It allows the realization of WCR without correcting additives Signup and view all the answers

Which of the following is not a possible solution for water cleansing as mentioned?

Oxygen oxidation Signup and view all the answers

How is scaling removal promoted by adding Trilon B to salt-free water?

By preventing iron oxides deposition Signup and view all the answers

What determines the allowed thickness of scaling in steam generators?

Temperature of tube material Signup and view all the answers

What parameter is represented by Reynolds number ReV and ReL in the context of two-phase flows?

Velocity Signup and view all the answers

What does the coefficient X² represent in the context of two-phase flows?

Unknown parameter Signup and view all the answers

Which term accounts for drops due to local resistances in two-phase flows?

Complex Ф² for steam and water Signup and view all the answers

What is the purpose of the parameter 'ρ′fin, ρ′in' in equation for drops due to acceleration in two-phase flows?

To represent final and initial values of circulation rate Signup and view all the answers

What contributes to the static pressure drop in two-phase flows according to the text?

Sum of scales of the fluid columns for all channel sections Signup and view all the answers

In two-phase flows, what does the term 'steam quality' x represent in the equation for drops due to acceleration?

Final and initial steam density Signup and view all the answers

What is the condition for unambiguous HDC according to the text?

(∆hin r) * (ρ' ρ'' - 1) ≤ B, where B > 7.5 Signup and view all the answers

What are the consequences of incorrect water chemical regime at NPP SG as per the text?

All of the above Signup and view all the answers

What is the main method suggested in the text to fight thermal maldistribution?

Installing orifices for all inlet regions of the channels Signup and view all the answers

What does medium subcooling to saturation temperature represent in the context provided?

Temperature difference from saturation temperature Signup and view all the answers

Why is resistance of the evaporation zone Δpev dependent on medium flow rate G?

To achieve unambiguous HDC Signup and view all the answers

What is the purpose of ensuring a correct water chemical regime at NPP SG?

To prevent equipment degradation and failure Signup and view all the answers

What is the main method suggested for preventing tube-to-tube temperature imbalance?

Installing orifices on all the tubes Signup and view all the answers

In the context provided, what factor may lead to the transition of some tubes into an impaired heat transfer mode?

Maldistribution in headers Signup and view all the answers

What type of calculation adjustments are mentioned in the text?

t1=var, p2=const Signup and view all the answers

To prevent thermal maldistribution, what is suggested regarding balancing headers?

Variable diameter of the tube Signup and view all the answers

What is recommended as a method for the prevention of tube-to-tube temperature imbalance?