Dryness fraction of steam - thermodynamics, Mechanical Engineering

Dryness Fraction of Steam:

Dryness fraction of steam is factor which used to specify the quality of steam. It can be defined as the ratio of weight of dry steam Wds present in known quantity of wet steam to total weight of Wet steam Wws. It is unit less quantity and is denoted by x. Thus

x = Wds/Wds + Wws

it is evident from above equation that x = 0 in pure water state as WdS = 0. It can also be seen, in figure 1 that Wds  = 0 in water state. But for presence of very small amount of dry steam that is Wds = 0, x will be greater than zero as shown in the Figure 2. On the other hand for no water particles at all in sample of steam, Wws = 0. Thus x can acquire maximum value of 1. It cannot be above 1. The values of dryness fraction for different states of steam are shown in figure given below, and are as follows.

(i) Wet steam 1 > x > 0    

(ii) Dry saturated steam   x = 1

(iii) Superheated steam   x =1

The dryness fraction of sample of steam can be found experimentally by means of calorimeters.

 

Posted Date: 10/15/2012 6:04:23 AM | Location : United States







Related Discussions:- Dryness fraction of steam - thermodynamics, Assignment Help, Ask Question on Dryness fraction of steam - thermodynamics, Get Answer, Expert's Help, Dryness fraction of steam - thermodynamics Discussions

Write discussion on Dryness fraction of steam - thermodynamics
Your posts are moderated
Related Questions
HOW TO PREPARE A DRAWING IN FIRST ANGLE PROJECTION AND THIRD ANGLE PROJECTION AND WHAT IS THEIR BASIC PRINCIPLE AND WE DO NOT MAKE DRAWING IN 2ND ANGLE PROJECTION AND 4TH ANGLE PRO

A semi-elliptic multi-leaf spring is needed for the suspension of the rear axle of a truck. It consists of two extra full-length leaves and ten graduated length leaves including th

Registering a Small Scale Unit: Small Scale and ancillary units (i.e. undertaking with investment in plant and machinery of less than Rs. 6.0 million and Rs. 7.5 million respectiv

Elastic Limit: Sol. : When external force acts on the body, the body tends to undergo some deformation. If external force is removed and body comes back to its original shap

Q. Insulation for personnel protection? Insulation for personnel protection shall be provided as follows on all piping and equipment adjacent to work platforms or other operati

A hot gas at 300°C flows through a long metal pipe 100mm outer diameter and 3mm thick. From the standpoint of safety and energy conservation, mineral wool insulation of thermal con

A rod of 80mm diameter and 10mm length with thermal conductivity 16W/m-deg protrudes from a surface at 160 o C. The rod is exposed to air at 30 o C with convective coefficient of

F AC T OR S AFFECTING THE SELECTION OF BOILER: -     Working Pressure and amount of steam needed. -     Floor area required. -     Operating and Maintenance Required

a concrete column of 350mm diameter is reinforced with 4 bars of 25mm diameter . find the stress when the concrete is subjected to a stress of 4.5 MPa . also find the safe load in

Gears : A gear is a disc with teeth on its boundary. If these teeth are formed at its inner boundary then this gear is known as an internal gear (annulus). These types of gears ar