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Transport Phenomena II Essentials
Transport Phenomena II Essentials
Transport Phenomena II Essentials
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Transport Phenomena II Essentials

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REA’s Essentials provide quick and easy access to critical information in a variety of different fields, ranging from the most basic to the most advanced. As its name implies, these concise, comprehensive study guides summarize the essentials of the field covered. Essentials are helpful when preparing for exams, doing homework and will remain a lasting reference source for students, teachers, and professionals. Transport Phenomena II covers forced convention, temperature distribution, free convection, diffusitivity and the mechanism of mass transfer, convective mass transfer, concentration distribution in solids and in laminar flow, and the equation of change for multicomponent systems.
LanguageEnglish
PublisherResearch & Education Association
Release dateJan 1, 2013
ISBN9780738672472
Transport Phenomena II Essentials

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Transport Phenomena II Essentials - The Editors of REA

CHAPTER 8

FORCED CONVECTION

8.1 DEFINITION

(1)

e9780738672472_i0002.jpg

(2)

e9780738672472_i0003.jpg

(3)

e9780738672472_i0004.jpg

(4)

e9780738672472_i0005.jpg

(5)

e9780738672472_i0006.jpg

(6)

e9780738672472_i0007.jpg

(7)

e9780738672472_i0008.jpg

8.2 FLOW OVER A FLAT PLATE

8.2.1 LAMINAR FLOW

e9780738672472_i0009.jpg

Restrictions:

(1) 0.6 ≤ Pr ≤ 50

(2) 100 < R < Re < Rex,c e9780738672472_img_8771.gif 5 × 10⁵

(3) Evaluate properties at tm

(4) Dissipation is neglected

e9780738672472_i0010.jpg

Restrictions:

(1) Pr < 0.05

(2) Re < Rex,c e9780738672472_img_8771.gif 5 × 10⁵

(3) Evaluate properties at tm m

(4) Dissipation is neglected

8.2.2 TURBULENT FLOW

e9780738672472_i0011.jpg

Restrictions:

(1) 0.6 ≤ Pr ≤ 60

(2) Properties at tm

(3) Dissipation is neglected

e9780738672472_i0012.jpg

Restrictions:

(1) 0.6 ≤ Pr ≤ 60

(2) R = 5 × 10⁵ ex,c

(3) Evaluate properties at tm m

(4) Dissipation is neglected

(5) Obtain A from table 8.1

Table 8.1

8.3 FLOW INSIDE CYLINDRICAL PIPES AND TUBES

8.3.1 LAMINAR FLOW

e9780738672472_i0014.jpg

Restrictions:

(1) Fully developed flow

(2) ReD < 2300

(3) Constant surface temperature, ts = constant

(4) Evaluate properties at tmb

(5) e9780738672472_i0015.jpg

e9780738672472_i0016.jpg

Restrictions:

(1) 0.48 < Pr < 16,700

(2) Evaluate properties except µs at tmb

Evaluate µs at t s

(3) e9780738672472_i0017.jpg

8.3.2 TURBULENT FLOW

e9780738672472_i0018.jpg

Restrictions:

(1) n = 0.4 for t > t

(2) n = 0.3 for ts < tb

(3) 0.7 < Pr < 160 10 ⁴

(4) |ts – tb| < 6°C for liquids |ts – tb| < 60°C for gases

(5) Evaluate properties at tb

(6) Fully developed flow

Effect of starting length is negligible

e9780738672472_i0019.jpg

(7) ReD > 2300

e9780738672472_i0020.jpg

Restrictions:

(1) 0.7 < Pr < 160

(2) 10⁴ < ReD < 10⁶

(3) Evaluate properties except µs at tb

Evaluate µs at ts

(4) Fully developed flow

(5) Effect of starting length is negligible e9780738672472_i0021.jpg

8.4 HEAT-TRANSFER COEFFICIENT FOR TRANSITION FLOW INSIDE A PIPE

Fig. 8.1

e9780738672472_i0022.jpg
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