Homework Answers
The flow of Engine oil in pipe flow can be considered as a thermal entry length problem is true. The region of flow over which thermal boundary layer forms and when it reaches tube centre it is called as thermal entry length region and length in this region is called thermal entry length. As the Engine oil will flow through pipe with some temperature and the pipe flow can be considered as thermal entry length problem
Answer : True
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Flow of engine oil in pipe flow can be considered a thermal entry length problem. O...
DON’T disregard the thermal conductivity of the pipe 3.) Oil at 200 C flows in a pipeline. The pipe has a 30-cm diameter and the flow is at an average velocity of 2 m/s. A 200-m-long section of t...
DON’T disregard the thermal conductivity of the pipe
3.) Oil at 200 C flows in a pipeline. The pipe has a 30-cm diameter and the flow is at an average velocity of 2 m/s. A 200-m-long section of the pipeline passes through icy waters of a lake at 0° C. The pipe is uncoated carbon steel with a thermal conductivity of 61 W/m o C. Determine (a) the temperature of the oil when the pipe leaves the lake, (b) the...
Two-pipe concentric concentric) for cooling the engine oil with the help of a water stream in...
Two-pipe concentric concentric) for cooling the engine oil with the help of a water stream in a large diesel engine a reverse (opposite) flow heat exchanger is used. Water at a flow rate of 0.3 kg/h from inside pipe with an inside diameter of 56 mm It flows. The inner pipe is made of stainless steel with a heat transmission coefficient of 16 W/mc and is meat (wall its thickness is 3 mm. Apart from this there is another pipe...
5. Oil Flow in a Pipe Oil (S 0.80;0.01 lb s ft-2) flows downward in the...
5. Oil Flow in a Pipe Oil (S 0.80;0.01 lb s ft-2) flows downward in the pipe shown in Figure 3. The pipe diameter is 0.10 ft and has a slope of 30°. The mean fluid velocity is 3 ft s1. What is the pressure gradient, de, along the length of the pipe? 30° Figure 3: Schematic of oil flow in a pipe. Answer(s):-71 lb ft-2 ft-1
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperat...
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
Question 1 a- The friction factor for laminar flow doesn’t depend on pipe roughness. .(True) (false)...
Question 1 a- The friction factor for laminar flow doesn’t depend on pipe roughness. .(True) (false) b- The friction factor for laminar flow can be directly calculated, but experiments are needed to find the friction factor for turbulent flow. . (True) (false) c- The head losses for an orifice meter and venture meter are about the same .(True) (false) d- Head loss can be expressed in dimensions of length . (True) (false) e Which of the following effects can be...
Engine oil supplied through a 2-cm-diameter thin walled copper pipe (k = 385 W/kg·ºC) is to...
Engine oil supplied through a 2-cm-diameter thin walled copper pipe (k = 385 W/kg·ºC) is to be heated from 20ºC to 60ºC at a rate of 0.3 kg/s in a double-pipe heat exchanger by condensing steam at a temperature of 130ºC, which is supplied through an outer pipe with a diameter of 4 cm. If the heat exchanger is well insulated, determine the length of the heat exchanger required
Engine oil supplied through a 2cm diameter thin walled copper pipe. k-385w/kg,c is to be heated...
Engine oil supplied through a 2cm diameter thin walled copper pipe. k-385w/kg,c is to be heated from 20C to 60C at a rate of 0.3kg/s in a double-pipe heat exchanger by condensing steam at a temperature of 130C, which is supplied through an outer pope with a diameter of 2 cm. if the heat exchager is well insulated determine the length of the heat exchanger
A can of engine oil with a length of 155 mm and a diameter of 100...
A can of engine oil with a length of 155 mm and a diameter of 100 mm is placed vertically in the trunk of a car. In a hot summer day, the temperature in the trunk is 43°C. If the surface temperature of the can is 17°C, determine heat transfer rate from the can surface. Neglect the heat transfer from the ends of the can and radiation heat transfer. Given: The properties of air at film temperature of 30°C. k...
Problem The relation between pressure drop and flow rate of laminar flows in a pipe is given by l...
Problem The relation between pressure drop and flow rate of laminar flows in a pipe is given by l bar 50 m 20° 128u dz PS Flow rate Q is the product of the average velocity and the cross-sectional area of the pipe What is the pressure needed to drive a viscous oil flow upslope through a 12 cm diameter pipe? The length of the pipe is 50 meters. The slope is 20°. At the end of the pipe, the...
Problem 10 Consider a cylinder falling inside a pipe that is filled with oil. The small...
Problem 10 Consider a cylinder falling inside a pipe that is filled with oil. The small space between the cylinder ant the pipe is lubricated with an oil film that has viscosity u. Pipe Derive a formula for the steady rate of descent of a cylinder with weight W, diameter d, and length l sliding inside a vertical smooth pipe that has inside diameter D. Assume that the cylinder is concentric with the pipe as it falls. Use the general...
DON’T disregard the thermal conductivity of the pipe
3.) Oil at 200 C flows in a pipeline. The pipe has a 30-cm diameter and the flow is at an average velocity of 2 m/s. A 200-m-long section of the pipeline passes through icy waters of a lake at 0° C. The pipe is uncoated carbon steel with a thermal conductivity of 61 W/m o C. Determine (a) the temperature of the oil when the pipe leaves the lake, (b) the...
Two-pipe concentric concentric) for cooling the engine oil with the help of a water stream in a large diesel engine a reverse (opposite) flow heat exchanger is used. Water at a flow rate of 0.3 kg/h from inside pipe with an inside diameter of 56 mm It flows. The inner pipe is made of stainless steel with a heat transmission coefficient of 16 W/mc and is meat (wall its thickness is 3 mm. Apart from this there is another pipe...
5. Oil Flow in a Pipe Oil (S 0.80;0.01 lb s ft-2) flows downward in the pipe shown in Figure 3. The pipe diameter is 0.10 ft and has a slope of 30°. The mean fluid velocity is 3 ft s1. What is the pressure gradient, de, along the length of the pipe? 30° Figure 3: Schematic of oil flow in a pipe. Answer(s):-71 lb ft-2 ft-1
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
Problem The relation between pressure drop and flow rate of laminar flows in a pipe is given by l bar 50 m 20° 128u dz PS Flow rate Q is the product of the average velocity and the cross-sectional area of the pipe What is the pressure needed to drive a viscous oil flow upslope through a 12 cm diameter pipe? The length of the pipe is 50 meters. The slope is 20°. At the end of the pipe, the...
Problem 10 Consider a cylinder falling inside a pipe that is filled with oil. The small space between the cylinder ant the pipe is lubricated with an oil film that has viscosity u. Pipe Derive a formula for the steady rate of descent of a cylinder with weight W, diameter d, and length l sliding inside a vertical smooth pipe that has inside diameter D. Assume that the cylinder is concentric with the pipe as it falls. Use the general...
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