Vertical shell and tube type, water tube HRSG

A shell and tube heat exchanger in which steam is generated in the tubes by heat transferred from a hot fluid on the shell side.

Vapor Barrier

A metallic foil placed between layers of refractory as a barrier to flue gas flow.

Sublimation Line, Fusion Line & Vaporization Line

The line that separates the solid and vapor phases is called the sublimation line. 

The line that separates the solid and liquid phases is called the fusion line. 

The line that separates the liquid and vapor phases is called the vaporization line.

Saturation Temperature, Saturation Pressure and Vapor Pressure Curve

The term saturation defines a condition in which a mixture of vapor and liquid can exist together at a given temperature and pressure.

The temperature at which vaporization (boiling) starts to occur for a given pressure is called the saturation temperature or boiling point. 

 

The pressure at which vaporization (boiling) starts to occur for a given temperature is called the saturation pressure.

The graphical representation of this relationship between temperature and pressure at saturated conditions is called the vapor pressure curve.

Sublimation, Vaporization, Condensation and Fusion or Melting

Sublimation - change of phase from solid to vapor

Vaporization - change of phase from liquid to vapor

Condensation - change of phase from vapor to liquid

Fusion or melting - change of phase from solid to liquid

Viscosity

It is the property of a fluid which offers resistance to the movement of one layer of fluid over another adjacent layer

Voice

Voice is the form of a verb which shows whether what is denoted by the subject does something or has something done to it

Verb of incomplete predication

The intransitive verb seems requires a word to make the sense complete. Such a verb is called a verb of incomplete predication.

Verb

A verb is a word used to express an action of a person, place or thing

VAT (Value Added Tax)

A tax levied on the value of each of the processes carried out by a business.

Variable Costs

Expenses that vary directly with the amount of work being performed.

VALENCY

The combining capacity of any element is called valency