Saturated process steam (1 atm, t 100'c, he 2,257 kj/kg) is condensed in a one-shell one-tube pass heat exchanger. a liquid stream (p 998 kg/m', cp = 4,181 j/kg-k, μ = 959 x 10" ns/m, k 0.606 w/m-k) enters the thin-walled copper tubes of 14 mm diameter and 3 m length at 15°c with an average velocity of 2 m/s. if the convective heat transfer coefficient for condensation outside the tubes is 21,800 w/m'k, determine: a) (20 points) the number of tubes n required to condense 5 kg of steam per second. b) (5 points) the outlet temperature, ts of the liquid stream. c) (5 points) the condensation rate, that can be achieved with this heat exchanger using the same liquid stream flowrate and inlet temperature.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a