Information the Might be Useful for the Exam

Information the Might be Useful for the Exam Unit conversions and physical properties of water 1 ft3 = 7.48 gal; 1 cfs = 448.8 gpm; 20oC: 60oF: 1 hp = 550 ft-lb/s r = 998.2 kg/m3 g = 9.79 kN/m3 n = 1.00x10-6 m2/s m = 1.00x10-3 N-s/m2 pvap = 2.34 kPa = 0.00234 atm r = 1.94 slug/ft3 g = 62.4 lb/ft3 n = 1.21x10-5 ft2/s m = 2.34x10-5 lb-s/ft2 pvap = 0.256 lb/ft2 Equations characterizing friction and headloss in turbulent pipe flow: D 1 2.71 - 2 log

f 3.7 Re f D 1.11 6.9 1 - 1.8log Re f 3.7 Colebrook Eqn. Haaland Eqn. D 2.51n 2 gDhL V - 2

log l D 3.7 l 2 gDhL Hazen-Williams Eqn for SI units (for BG units, replace 0.849 by 1.318, 10.7 by 4.73, and 0.278 by 0.432): V 0.849CHW R 0.63 h hL l

Q1.85 1 hL 10.7l 4.87 1.85 D CHW 0.54 Q 0.278 D 2.63 S 0.54CHW Headloss equations for equivalent pipes: hL , series K i Q n hL , parallel K - 1/ n - n i Iterative corrections for analysis of pipe networks: h L ,i ,0

Q j ,0 - loop hL ,i ,0 n loop Qi ,0 h j ,0 - n Qi ,0 node Qi ,0 node hL ,i ,0 n Qtot Net Positive Suction Head Available (NPSHA): The absolute dynamic head in the pump inlet in excess of the vapor pressure Vs2 pvap

NPSH A g 2g g ps ,abs zsl ,max patm ,abs g - h L - pvap g

- NPSH R Some useful dimensionless groups for pump similitude: g TDH CH 2 2 D CP Pshaft 3 r D 5 Pf Pshaft To a good approximation, for geometrically similar pumps, all are functions of only CQ Q D.3

Some Basic Information Expected to be Known p2 V22 p1 V12 z2 z1 hpump - hturb g 2g g 2g l V2 hL f D 2g For a given pipe: f lam h L, f 64 Re ' Q hL klam

hL k full Q 2 turb V2 hL K minor 2g Aflow D 2 4 D R Rh Pwetted D 4 2 Pfluid gQh Explain some aspect of these diagrams. For example, why do the curves change as they do?; what would happen if a new pump or pipe were added to the system, or if an existing pump were replaced

with a similar one with a larger diameter?; etc. Typical Exam Questions Characterize a pipe equivalent to A, B, C, and D. If an equivalent pipe were identified, and a second pipe parallel to D were then installed, would the length of the equivalent pipe increase, decrease, or not change? Given initial guesses of Q and the values of K and n for hL=KQn in each pipe, what would be the correction to the flow in pipe BE? Sketch reasonable pump curves and system curves for the above network, for conditions where the upper reservoir is at its (1) highest and (2) lowest levels. CH

CH CP CP CQ If the conditions in a system with this fixed-speed pump changed so that CQ increased from 0.05 to 0.06, how much would the fluid power change, if at all?

Recently Viewed Presentations

  • Land and Environment Court of NSW  25th Anniversary

    Land and Environment Court of NSW 25th Anniversary

    Land and Environment Court of NSW 25th Anniversary Dinner Parliament House 1st September 2005 (L-R: The Honourable Justice Nicola Pain, Judge of the Land and Environment Court, the Honourable Justice Dennis Cowdroy, Judge of the Land and Environment Court, Registrar...
  • AAHAM Legislative Day

    AAHAM Legislative Day

    Two in every five American homes (39.4%) had only wireless telephones (also known as cellular telephones, cell phones, or mobile phones) during the first half of 2013, an increase of 1.2 percentage points since the second half of 2012.
  • POETRY -

    POETRY -

    AIMS POETRY REVIEW POETRY A type of literature that expresses ideas, feelings, or tells a story in a specific form (usually using lines and stanzas) POETRY LINE - a group of words together on one line of the poem STANZA...
  • CS 3343: Analysis of Algorithms

    CS 3343: Analysis of Algorithms

    2/12/2018. Exam (midterm 1) Closed book exam. One cheat sheet allowed (limit to a single page of letter-size paper, double-sided) Wednesday, Feb 21, class time + 5 minutes
  • Temperature, Pulse, Respirations

    Temperature, Pulse, Respirations

    Define Temperature 2. List the four ways to take a temperature. 3. What is a normal temperature? Take your partners axillary temperature and record reading. TEMP: PULSE THE WAVE OF BLOOD CREATED BY THE HEART PUMPING, THAT TRAVELS ALONG THE...
  • Lecture 03: SQL Friday, October 3, 2003 1

    Lecture 03: SQL Friday, October 3, 2003 1

    Lecture 03: SQL Friday, October 3, 2003
  • 1 3                      :      )     (        )     (    (

    1 3 : ) ( ) ( (

    The term "date rape drug" originated in journalism and has no strict scientific or legal definition. A wide variety of substances can be used to incapacitate a person, and all of them have sometimes been taken willingly by people in...
  • Eligible Section 232 Mortgage Insurance Programs Handbook Chapter

    Eligible Section 232 Mortgage Insurance Programs Handbook Chapter

    Includes MIP. Released after maintaining an average of underwritten Debt Service Coverage Ratio for 12 consecutive months. ... The Lender must consult the most recent Federal Emergency Management Agency (FEMA) Flood Map to determine if the property is located in...