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20092010 Chapter 3 Nonequilibrium Kinetic Theory and Transport Phenomena of Gas Home Work 5: 1. Water flows through a fire hose of diameter 6.35cm at...

石油在20O条条
ç(888kg/m3
和0.8千克/米s)是通过一个不断流动的长30米
圆柱管与一个直径5厘米。在流动,在管道入口和出口压力
测得823帕斯卡届96千帕时,分别。确定通过该管道的石油流量
假设该管道是(1)水平,(二)为为15o倾斜
向上,(三)为斜为15o
向下。也验证
即通过管道流层。

2009 2010 春 《热学》习题 邢玉梅 2010 05 02 Chapter 3 Non equilibrium Kinetic Theory and Transport Phenomena of Gas Home Work 5: 1. Water flows through a fire hose of diameter 6.35cm at a rate of 0.012 m 3 /s. The fire hose ends in a nozzle with an inner diameter of 2.20cm. What is the speed at which the water exits the nozzle? 2. The effective diameter of nitrogen molecule is m 10 10 8 . 3 , to calculate the mean free path of nitrogen molecule and the mean collision time for continual two times. 3. The effective diameter of oxygen molecule is m 10 10 6 . 3 , the calculate the collision frequency of oxygen molecules, respectively when (a) the temperature of oxygen is 300K, and the pressure is 1.0atm. (b) The temperature of oxygen is 300K, and the pressure is 6 10 0 . 1 atm. 4. The mean free path of some kind of gas molecule is m 7 10 63 . 2 when the temperature is 25 , (a) to calculate gas pressure when the effective diameter of gas molecule is m 10 10 6 . 2 . (b) To calculate the collision times with other gas molecules in 1m distance. 5. Oil at 20 o C ( 888 kg / m 3 and 0.8 kg / m s ) is flowing steadily through a 30m long cylinder pipe with a diameter of a 5cm. During the flow, the pressure at the pipe inlet and exit are measured to be 823 KPa nd 96 KPa, respectively. Determine the flow rate of oil through the pipe assuming the pipe is (a) horizontal, (b) inclined 15 o upward, (c) inclined 15 o downward. Also verify that the flow through the pipe is laminar.
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