A 50 mm diameter shaft rotates in a sleeve of 50.3 mm internal diameter and length 100 mm. In the annulus space, a lubricating oil of viscosity u = 0.11 Pa-s is filled. Calculate the rate of heat generation when the shaft rotates at 200 rpm.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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5. A 50 mm diameter shaft rotates in a sleeve of 50.3 mm internal diameter and
length 100 mm. In the annulus space, a lubricating oil of viscosity u = 0.11 Pa-s
is filled. Calculate the rate of heat generation when the shaft rotates at 200 rpm.
6. A glass capillary tube of diameter 0.3 mm and length 60 mm is dipped in a water
having surface tension 0.017 N/m. The contact angle between the liquid and the
tube wall is 40°. Will the water overflow through the tube? If not, comment on
the nature and radius of meniscus.
7. Determine the absolute pressure of air flowing in a circular duct using an inclined
tube manometer, as shown in Fig. 2.49. The barometer reading is 740 mm Hg.
Air
150 mm
200 mím
Water
30°
Fig. 2.49
Transcribed Image Text:5. A 50 mm diameter shaft rotates in a sleeve of 50.3 mm internal diameter and length 100 mm. In the annulus space, a lubricating oil of viscosity u = 0.11 Pa-s is filled. Calculate the rate of heat generation when the shaft rotates at 200 rpm. 6. A glass capillary tube of diameter 0.3 mm and length 60 mm is dipped in a water having surface tension 0.017 N/m. The contact angle between the liquid and the tube wall is 40°. Will the water overflow through the tube? If not, comment on the nature and radius of meniscus. 7. Determine the absolute pressure of air flowing in a circular duct using an inclined tube manometer, as shown in Fig. 2.49. The barometer reading is 740 mm Hg. Air 150 mm 200 mím Water 30° Fig. 2.49
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