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A lab technician, working in a lab has poured liquid chloroform into a test tubes with inner
diameter of 25 mm. The test tube holds an amount of 29.46 cm3
liquid chloroform at a level of
1 cm from the top (Figure 2). The chloroform molecular weight and vapor pressure is 119.38
kg/kmol and 21 kPa respectively. The evaporation of chloroform to the surrounding air is
occurring at 25 C and 1 atm. If the diffusion coefficient of chloroform in air is DAB is 0.104 cm2
/s,
determine the rate of evaporation and the time taken for half of the chloroform to be evaporated
at the stated condition. Given the density of the chloroform is 1.49 g/cm³.
An 8 cm internal diameter with 30 cm high pitcher half filled with water is left in a dry room at
15°C and 87 kPa with its top open. If the water is maintained at 15°C at all times, determine how
long it will take for the water to evaporate completely. Given, the saturation pressure of water
at 15°C is 1.705 kPa
a horizontal tube carrying hot water has a surface temperature of 355.4 K and the outside diameter of 25.4 mm. The tube is exposed to room air at 294.3 K. Calculate the nature convection heat loss for a 1 m length of pipe. if the tube is replaced with two horizontal plate and the bottom plate is hotter than the upper plate. compared the resulted value of natural convection heat loss using tube and plate
a glass window with an area of 0.557 m² is installed in the wooden outside wall of a room. The wall dimension are 2.44 x 3.05 m. The wood has a k of 0.1505 W/m.K and is 25.4 mm thick. the glass is 3.18 mm thick and has a k of 0.692. the inside temperature is 299.9 K (26.7 degree Celsius) and the outside air temperature is 266.5 K . The convection coefficient hi on the inside wall of the glass and the wood is estimated as 8.5 W/m².K ; the outside ho is also estimated as 8.5 for both surfaces . Calculate the heat loss through the wooden wall, through the glass and the total
A fuel Oil temperature is decreased from 150°C to 90°C and water temperature is increased from 25°C to 70°C in a counter current double pipe heat exchanger. What is the value of LMTD?
For a liquid being cooled, the viscosity correction factor is (greater than less than/equal to) unity, and for a liquid being heated, the viscosity correction factor is ____(greater than/less than/equal to) unity? (Sieder-Tate equation) (write the answers in the same order of blanks given)
The wall of an oven operating at 1000°C consists of two layers of different material. The inside layer of wall is built of 40cm of kaoline firebrick having k-0.08 W/m-K, surrounded by 40cm of fireclay brick having k-0,8 W/m-K. The outer side of the wall is maintained at Process Heat Transfer 50°C. What is the temperature at the interface of the layers?_____
What are the various dimensionless numbers that characterize the convection heat transfer in laminar flow through tubes?______ (only write the dimensionless numbers)
What are the various dimensionless numbers that characterize the natural convection heat transfer?________ (only write the dimensionless numbers)
For industrial applications, nucleate boiling is undesirable (yes or No)
