By J. Welty, et. al.,
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Extra info for Fundamentals of Momentum, Heat and Mass Transfer
47 N/m. 55 mm. Contact angles are 08 for water and 1308 for mercury. 30 Determine the diameter of the glass tube necessary to keep the capillary-height change of water at 308C less than 1 mm. Chapter 2 Fluid Statics The deﬁnition of a ﬂuid variable at a point was considered in Chapter 1. In this chapter, the point-to-point variation of a particular variable, pressure, will be considered for the special case of a ﬂuid at rest. A frequently encountered static situation exists for a ﬂuid that is stationary on Earth’s surface.
15' A 10 in. 16 The car shown in the ﬁgure is accelerated to the right at a uniform rate. What way will the balloon move relative to the car? 20 A circular log of radius r is to be used as a barrier as shown in the ﬁgure below. If the point of contact is at O, determine the required density of the log. 17 The tank is accelerated upward at a uniform rate. Does the manometer level go up or down? 21 A rectangular block of concrete 3 ft Â 3ft Â 6 in. has its 6in. side half buried at the bottom of a lake 23 ft deep.
The right-hand edge of the block is ﬂush with the water. 26 The ﬁgure below shows an open triangular channel in which the two sides, AB and AC, are held together by cables, spaced 1 m apart, between B and C. Determine the cable tension. Cable B C Water A 6m Chapter 3 Description of a Fluid in Motion The development of an analytical description of ﬂuid ﬂow is based upon the expression of the physical laws related to ﬂuid ﬂow in a suitable mathematical form. Accordingly, we shall present the pertinent physical laws and discuss the methods used to describe a ﬂuid in motion.