Department of Mechanical engineering

Subject: Design of heat transfer equipments Date:

Subject code: Time: 1 hour

.THEORY: - A small hole made inside or bottom of the tank is called orifice.

1. CO-EFFICIENT OF VELOCITY:- The ratio of actual velocity of jet of Vena-Contracta (Vc) to that of the Theoretical velocity (Vth).

Mathematically

CO-EFFICIENT OF VELOCITY

2. CO-EFFICIENT OF DISCHARGE (Cd):- It is defined as the ration of actual discharge from an orifice to the theoretical discharge. It is denoted by Cd

HYDRAULIC CO-EFFICIENTS ARE

1. Co-efficient of velocity.

2. Co-efficient of Discharge.

3. Co-efficient of contraction.

1. CO-EFFICIENT OF VELOCITY:- The ratio of actual velocity of jet of Vena-Contracta (Vc) to that of the Theoretical velocity (Vth).

OR

Q2) 1,75,000lb/hr of distilled water enters an exchanger at 930 F and leaves at 850 F. The heat will be transferred to 2,80,000 lb/hr of raw water supplied at 750 F and leave the exchanger at 800 F at 10 psi pressure drop may be expected on both the streams while Rd= 0.0005 for the distilled water and 0.0015 for raw water. When the tube velocity exceeds 6FPS available for this service is a 15.25“ ID exchanger having 160 3.25“ OD 18BWG 16 ft long tubes laid out on 15/16“ triangular pitch. The bundle is arranged for 2 passes and baffles are spaced 12” apart will the exchanger be suitable? (25 Marks)

Q1) 6900 lb/hr of 260 API lubricating oil must be cooled from 4500-3500F by 72500 lb/hr of 340 API midcontinent crude oil. The crude will be heated from 3000-3100 F. A fouling factor of 0.003 should be provided for each stream and allowable pressure drop on each stream will be 10 psi. A number of 20 ft hair fins of 3/2 “ IPS are available how many must be used and how shall they be arranged the viscosities are 1.4 centipoises at 500 F for lubricating oil 3.08 4000 F and 7.7 at 3000 F. (25 MarksSemester:

IIIrd SEM M.Tech

Note: Answer any one question

Sl.No EXPERIMENTS

1. Flow Through orifice

2. Flow over notches a) Flow Through Rectangular Notch.b) Flow Through Triangular Notch.c) Flow Through Trpizoidal Notch.

3. Friction Through Pipe (Minor Losses) a) For sudden enlargement. b) For Sudden Contraction. c) For 900 Bend. d) For Elbow

4. Friction through pipe (Major losses)

5. Impact of Jet

6. Flow Through venturimeter

7. Flow through orificemeter

8. Single stage Centrifugal Pump

9. Efficiency of the Francis Turbine

10. Air Blower

11. Air Compressor

12. Reciprocating Pump

13. Pelton Wheel Turbine

AIM: - To determine hydraulic co-efficient for a given orifice

INSTRUMENT AND EQUIPMENTS REQUIRED

1. Orifice Apparatus.2. Orifice Plate.3. Vernier Calliper.4. Stop Watch.5. Scale.

THEORY: - A small hole made inside or bottom of the tank is called orifice.

HYDRAULIC CO-EFFICIENTS ARE

1. Co-efficient of velocity.2. Co-efficient of Discharge.3. Co-efficient of contraction.

1. CO-EFFICIENT OF VELOCITY:- The ratio of actual velocity of jet of Vena-Contracta (Vc) to that of the Theoretical velocity (Vth).

Mathematically

CO-EFFICIENT OF VELOCITY Cv=√ x2

4 YHOR Cv= x

√4 YH