Answered: 1. For flowing water, what is the…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Transcribed Image Text:Meaning Convective momentum-flux tensor Viscous momentum-flux tensor Molecular momentum-flux tensor Combined momentum-flux tensor po + 7+ pvv = pô + 7 O =+ pvv All these quantities are second-order tensors. Most of the time we will be dealing with components of these quantities. For example the components of o are: Px = TTx + pv,0x =p+ T+ pvv,x xy de = the combined flux of y-momentum across a surface perpendicular to the x TT xy pv Vy = Txy + pv,vy direction by molecular and convective mechanisms. Assignment 1 1. For flowing water, what is the magnitude of the velocity gradient needed to produce a shear stress of Fhe 2. Calculate the Reynolds numbers for the fow of water and for air through a 4-mm-diameter tube, if the mean N/m2? µ = 1.12x10-3 kg/m.s. velocity is 3 ms and the temperature 30°C is in both cases. Assume the air is at standard atmospheric pressure. 120 0.1 mm gap 3. A 10-kg block slides down a smooth inclined surface as shown in Fig. P1.64. Determine the terminal velocity of the block if the 0.1- mm gap between the block and the surface contains SAE 30 oil at 60 °F. Assume the velocity distribution in the gap is linear, and the area of the block in contact with the oil is 0.1 m2. 4. A layer of water flows down an inclined fixed surface with the velocity profile shown in Figure below. Determine the magnitude and direction of the shearing stress that the water exerts on the fixed surface for U = 2 m/s and h = 0.1 m. TOUNG

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