EBK THINKING LIKE AN ENGINEER
4th Edition
ISBN: 8220103633512
Author: OHLAND
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 9, Problem 4ICA
Calculate the numerical value of each of the dimensionless parameters listed in the table. Be sure to check that the ratio is actually dimensionless after you insert the values.
| Situation | Name | Expression | Value | |
| (a) | Air over a flat plate | Nusselt number, Nu |
|
|
| (b) | Wind making a wire “sing” | Strouhal number, St |
|
| Property | Symbol | Units | Value |
| Heat transfer coefficient | h | W/(m2 oC) | 20 |
| Thermal conductivity | k | W/(m K) | 0.025 |
| Plate length | L | ft | 2 |
| Air speed | va | mph | 60 |
| Oscillation frequency | ω | Hz or cycles/s | 140 |
| Wire diameter | Dwire | mm | 20 |
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A 2 cm thick steel pipe (thermal conductivity 43 W/[m °C]) with 6 cm inside diameter is being used to convey steam from a boiler to process equipment for a distance of 40 m. The inside pipe surface temperature is 115°C, and the outside pipe surface temperature is 90°C.
If there is 600kW of heat loss, what is the thickness of the pipe?
To understand the heat transfer from a bar in cross flow, you conduct a series of
experiments measuring the average heat transfer coefficient as a function of the free stream
velocity. A schematic of the experiment and the accompanying results are shown below.
L = 0.3 m
h [W/m²-K]
60
40
V [m/s]
20
15
a) You expect the important dimensionless parameters to be related by a function of
the form
Nu = CRe Pr
where C, m, and n are constants. The film temperature in both the experiments is
approximately the same. Use the given experimental results to determine the
constant m
b) Calculate h for L = 0.75 m and V = 30 m/s.
Check the following equation for dimensional homogeneity: mv =
= 1.5²
(Fcose) dt where m is mass, v is velocity, F is force, is an
angle, and t is time. Check that each term in the equation has the following dimensions: [MªLbTC] where you are to choose the
coefficients a, b, c.
Answers:
a =
i
b =
i
C=
Chapter 9 Solutions
EBK THINKING LIKE AN ENGINEER
Ch. 9.1 - The heat loss (Q/t, in units of joules per second...Ch. 9.2 - A simple expression for the velocity of molecules...Ch. 9.2 - What are the dimensions of the value 6 in the...Ch. 9.4 - The Euler number is a function of the pressure...Ch. 9 - Complete the following table. Dimensions ...Ch. 9 - Complete the following table. Dimensions ...Ch. 9 - Calculate the numerical value of each of the...Ch. 9 - Calculate the numerical value of each of the...Ch. 9 - A fluid with a specific gravity of 0.91 and a...Ch. 9 - Brine, with a density of 1.25 grams per cubic...
Ch. 9 - When a simple turbine is used for mixing, the...Ch. 9 - History suggests that Newton developed his idea...Ch. 9 - It is proposed to create a set of dimensionless...Ch. 9 - 1. While researching fluid dynamics, you come...Ch. 9 - 2. While researching fluid dynamics, you came...Ch. 9 - 3. While researching fluid dynamics, you come...Ch. 9 - 4. The Arrhenius number (Ar) is the dimensionless...Ch. 9 - 5. The Biot number (Bi) is the dimensionless...Ch. 9 - 6. A biodegradable fuel having a specific gravity...Ch. 9 - 7. A sludge mixture having a specific gravity of...Ch. 9 - 8. Water (specific gravity = 1.02; viscosity =...Ch. 9 - 9. We have been asked to determine a set of...Ch. 9 - 10. The Peclet number is used in heat transfer in...Ch. 9 - 11. When a fluid flows slowly across a flat plate...Ch. 9 - 12. In modeling the flow of liquid in a piping...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A cold storage wall (3m x 6m) is constructed of 15 cm thick concrete (thermal conductivity 1.37 W/[m °C]). Insulation must be provided to maintain a heat transfer rate through the wall at or below 500 W. If the thermal conductivity of the insulation is 0.04 W/(m "C), compute the required thickness of the insulation. The outside surface temperature of the wall is 38°C, and the inside wall temperature is 5°C. If thermal conductivity is 0.02 W/m °C, what is the thickness? What is the temperature between the two slabs, using problem above?arrow_forward3. Consider the following equation. All three of the terms in parentheses are dimensionless groups. Because kc is difficult to determine directly, the other variables are measured and kc is calculated from the given equation. 26 THERMODYNAMICS 1 MODULE 1 FUNDAMENTAL CONCEPTS ]3 [ _d>vp_jo8 p DAB kc D = 0.023 [H DAB What is the estimated value of kc? What are the units of kc? Show your work. The following values were measured: D = 8.0 mm, DAB = 0.475 cm²/s, µ = 1.12 x 103 N-s/m², p = 1.00 x 10-³ g/cm³, v = 15.0 m/s.arrow_forwardThe air resistance to the motion of a vehicle is something important that engineers investigate. As you may also know, the drag force acting on a car is determined experimentally by placing the car in a wind tunnel. For a given car, the experimental data is generally represented by a single coefficient that is called the drag coefficient. It is given by the relationship: Cd = Fd/(1/2)pV2A. What is the appropriate unit for Cd if the preceding equation is to be homogeneous in units?arrow_forward
- Ql: The viscosity in industrial measurement continue to use the CGS system of Lunits, since centimeters and grams vield convenient numbers for many fluids. The absolute viscosity () unit is the poise, I poise = 1 gtem. s). The kinematic viscosity (v) unit is the stohes, I stokes = 1 em /s. Water at 20C has u = 001 poise and also V= 0.01 stokes. Express these resalts in (a) SI and (h) BG tanits.arrow_forwardAssignment 3 On Viscosity Calculation - Word TOUT REFERENCES MAILINGS REVIEW VIEW Hyperlink P Bookmark tArt Chart Screenshot Apps for Office Online Video Cross-reference Comment Header Footer Page Number Text Quick WordA Box Parts - ns Apps Media Links Comments Header & Footer (2) Referring to the following figure, the distance between plates is Ay = 0.5 cm, Av: = 10 cm/s, and the fluid is ethanol at 273 K having a viscosity of 1.77cp (0.0177 g/cm s). (a) Calculate the shear stress ty and the velocity (b) gradient of shear rate -/dy using cgs units. (c) Repeat using SI units. A Torce Fdshear berween teoparailel platesarrow_forwardThermal conductivity k is a measure of the ability of a material to conduct heat. For conduction heat transfer in the x-direction through a surface normal to the x-direction, Fourier’s law of heat conduction is expressed as: Q=-kA.dT/dx where ?̇ is the rate of heat transfer and A is the area normal to the direction of heat transfer. Determine the primary dimensions of thermal conductivity (k). Look up a value of k and verify that its SI units are consistent with your result. Write a set of primary SI units for k.arrow_forward
- Center of mass TAAL Myn e un K 2 + qabure Cylinder has non-uniform density density is ply) = 5.25y-2.31 [ kg/m³] umit[m]. be: 0031/20 APP. Find ÿ of The density when radius is: 3,75 m height is 8.17m + + NAPOT. # 20 AT 12 VOTarrow_forward4:17 .l 86% google.com Water flows from point A to points D and E as shown. Some of the flow parameters are known, as shown in the table below. Determine the unknown parameters. Q1 V1 Q2 V2 D2 Qa V3 D3 D D: Q4 V4 A в D4 E Section Diameter [mm] | Flow rate [m³/s] Velocity [m/s] |AB BC 350 222 ??? 2?? Q3=2Q4 |Q«=0.5Q. 750 1.5 ??? 150 1.7 ??? CD СЕ C Chegg Visit Solved: Water Flows From Point A To Points D And E As Show ... Images may be subject to copyright. Learn more Related images O V tees f p A p Dd p E e ies ef pie de Gm t eeesnde pe the e be ple the er de e N d k hee may etheme4 Water fows fhem peint Ato pos Dand E as shon Sone of the flow parancters are knon, ashown in the able below Drenine he ukow paranem Sertan Dia r Phee rate Veleci jas LAB BC elect ja w y 150 ate K lo H- | Solved: Q3) Water Flows From Poi. chegg.com Solved: Quiz 2 Water Flows From P... TOTAL chegg.com Water flows theoagh a 150 m diameter horintal pipe at the steady ma flow rate of 60kg/s A meticn i fitted…arrow_forwardEstimate the Celsius equivalent of Absolute temperature (a) and standard Temperature (b). 19 put of BI三|に Paragraph question Path: p Maximum file size: 100MB, maximum number of files: 1 hparrow_forward
- A constant volume gas thermometer is used to determine the temperature of an unknown fluid. Pressure data for thermometer in the unknown bath (P) and a Triple Point Cell (P) are given below. P[Torr] 100.0 P [Torr] 127.9 200.0 256.5 300.0 385.8 400.0 516.0 What is the temperature of the unknown fluid bath? explain and show all work please and write clearlyarrow_forwardhet I a Water dB *** da hay = 370lmang da=200 [mm] dB = so[mm] no friction find Q hngarrow_forwardAnalyze the free-body diagram, given the coefficients of static and kinetic friction. Determine whether the block will slide and the net force on the system. static kinetic Hs = 0.25 friction is not shown, but must be incuded in calculations Hk = 0.2 fs,max = 50 %3D fr = W2 [N] slide? friction [N] friction direction | Fnel [N] 40 yes, down-righ 40 up-left v 22 W.-102 W2 W = 200N 50 up-left v (see table) 80 no W = 225N 50 down-righ no 120 18 40 down-righ 160 yes, up-left v 58 40 down-righ v yes, up-left annot be de 200 check answersarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning
Unit Conversion the Easy Way (Dimensional Analysis); Author: ketzbook;https://www.youtube.com/watch?v=HRe1mire4Gc;License: Standard YouTube License, CC-BY