(a)
The average temperature of the hot surface of the board when it is vertical.
(a)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Given:
The length of the board
The width of the board
The temperature of the room
The heat dissipated by the board
The emissivity of the surface of the board
The film temperature
Calculation:
Calculate the surface temperature of board
Refer Table A-22 “Properties of air at 1 atm pressure”.
Obtain the following values of different properties corresponding film temperature
Calculate the volume expansion coefficient
Calculate the characteristics length
Calculate the Rayleigh number
Calculate the Nusselt number
Calculate the area of heat transfer
Calculate the heat transfer coefficient of convection
Calculate the rate of heat transfer
By use of trial and error approach the surface temperature obtained is
Thus, the average temperature of the hot surface of the board is
(b)
The average temperature of the hot surface of the board when it is horizontal and hot surface facing up.
(b)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Calculation:
Calculate the characteristic length
Calculate the Rayleigh number
Calculate the Nusselt number
Calculate the heat transfer coefficient of convection
Calculate the rate of heat transfer
Thus, the average temperature of the hot surface of the board is
(c)
The average temperature of the hot surface of the board when it is horizontal and hot surface facing down.
(c)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Calculation:
Calculate the characteristic length
Calculate the Rayleigh number
Calculate the Nusselt number
Calculate the heat transfer coefficient of convection
Calculate the rate of heat transfer
Thus, the average temperature of the hot surface of the board is
Want to see more full solutions like this?
Chapter 20 Solutions
Fundamentals Of Thermal-fluid Sciences In Si Units
- An Inclining experiment done on a ship thats 6500 t, a mass of 30t was moved 6.0 m transvesly causing a 30 cm deflection in a 6m pendulum, calculate the transverse meta centre height.arrow_forwarda ship 150 m long and 20.5 m beam floats at a draught of8 m and displaces 19 500 tonne. The TPC is 26.5 and midshipsection area coefficient 0.94. Calculate the block, prismatic andwaterplane area coefficients.arrow_forwardA vessel loads 680 t fuel between forward and aft deep tanks. centre of gravity of forward tank is 24m forward of ships COG. centre to centre between tanks is 42 m. how much in each tank to keep trim the samearrow_forward
- Beam of a vessel is 11% its length. Cw =0.72. When floating in SW of relative denisity 1.03, TPC is 0.35t greater than in freshwater. Find the length of the shiparrow_forwardAn inclining experiment was carried out on a ship of 4000tonne displacement, when masses of 6 tonne were moved transverselythrough 13.5 m. The deflections of a 7.5 m pendulurnwere 81, 78, 85, 83, 79, 82, 84 and 80 mm respectively.Caiculate the metacentric height.arrow_forwardA ship of 10 000 tonne displacement has a waterplanearea of 1300 m2. The ship loads in water of 1.010 t/m3 andmoves into water of 1.026 t/m3. Find the change in meandraughtarrow_forward
- A ship of 7000 tonne displacement has a waterplane areaof 1500 m2. In passing from sea water into river water of1005 kg/m3 there is an increase in draught of 10 cm. Find the Idensity of the sea water.arrow_forwardA ship has 300 tonne of cargo in the hold, 24 m forward ofmidships. The displacement of the vessel is 6000 tonne and its centre of gravity is 1.2 m forward of midships.Find the new position of the centre of gravity if this cargo ismoved to an after hold, 40 m from midshipsarrow_forwardSketch and describe how ships are supported in dry dock. When and where does the greatest amount of stresses occur?arrow_forward
- Sketch and desribe a balanced rudder and how it is suspendedarrow_forwardA ship 140 m long and 18 m beam floats at a draught of9 m. The immersed cross-sectionai areas at equai intervais are 5,60, 116, 145, 152, 153, 153, 151, 142, 85 and 0 m2 respectively.Calculate:(a) displacement(b) block coefficient(c) midship section area coefficient(d) prismatic coefficient.arrow_forwardA steamer has waterplane area 1680m2 recorded in water with relative denisty 1.013. Displacement = 1200 t, calculate difference in draught in salwater reltive denisity 1.025.arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
![Text book image](https://www.bartleby.com/isbn_cover_images/9780190698614/9780190698614_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9780134319650/9780134319650_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781259822674/9781259822674_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781118170519/9781118170519_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781337093347/9781337093347_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781118807330/9781118807330_smallCoverImage.gif)