Example 1:
Hydraulic Jack consists of 2 cylinders with pistons of different diameters, one small and other
large. By applying a small force on the smaller cylinder, it is possible to support a heavier
January - April 2017
A.W.Jayawardena
Basic laws
Integral forms of governing equations -In fluid
mechanics, the basic laws contain integral quantities
of interest. For example,
Volume rate is the int
Examples on drag, terminal velocity and impact of jets on plates
Example 1:
A cylinder 80 mm in diameter and 200 mm long is placed in a stream of fluid flowing with a
velocity of 0.5 m/s. The axis of
PIPE NETWORKS
September-December,2017 A. W.
Jayawardena
Introduction
In many conveyance systems, several pipes are connected together
to form a network of pipes.
The network may have loops as well a
DRAG, LIFT, FLOW
SEPARATION, WAKE,
THRUST, WEIGHT
AND TERMINAL
VELOCITY
September-December, 2017
A. W. Jayawardena
Some definitions
Drag The force exerted by a flowing fluid on a body which tends to
FORCES ON A PIPE BEND CARRYING A
FLUID
In the following examples all fluids will be assumed to
be frictionless. i.e. there will be no shear forces.
Consider a control volume bounded by the pipe
surfac
September-December, 2017 A. W. Jayawardena
Circulation and Vorticity
Circulation and vorticity are the two primary measures
of rotation in a fluid.
Circulation is a macroscopic measure of rotation fo
Dimensional
Analysis
September-December, 2017
A.W.Jayawardena
Introduction
Very often, real problems in fluid mechanics do not have analytical
solutions. For example, there is no analytical means of
September-Decemberl, 2017 A. W. Jayawardena
Velocity Potential and Stream
Function
Definition - Potential flows are irrotational flows
whose velocity components may be derived from
velocity potential
Example 1
A cylindrical tank 60 cm in diameter with its axis vertical is filled to a depth of 150 cm with
water. What is the total pressure force on the curved surface? What is the resultant force on
Examples in Fluid Statics
Example 1
A cylindrical tank 60 cm in diameter with its axis vertical is filled to a depth of 150 cm
with water. What is the total pressure force on the curved surface? What
Tutorial 3: Potential Flow
1. Obtain the stream functions for (i) uniform flow with a velocity of 20 m/s parallel to the
positive direction of x-axis, (ii) uniform flow with a velocity of 10 m/s paral
The University of Hong Kong
Department of Civil Engineering
Fluid Mechanics (CIVL2013)
FLUID KINEMATICS
1.
A fluid flow is described by the velocity field
U 5 x 3 i 15 x 2 yj tk
Estimate the velocity
Tutorial No. 3: Governing equations of fluid flow
1.
Water flows in a horizontal rectangular channel. The water depth is 0.3 m and the flow
speed is 0.5 m/s uniformly over the depth. The flow passes o
The University of Hong Kong
Department of Civil Engineering
Mechanics of Fluids (CIVL2013)
DIMENSIONAL ANALYSIS
1. In determining the hydrodynamic resistance of an object, a model of length scale
1:5
2014-2015 Second Semester
Venue: Chow Yei Ching Building (CYC), LG302, Hydraulic Laboratory
Demonstrators:
Ms. LIU Ying (Discharge over Sharp-edged Weirs) [email protected] CB LG208
Mr. YANG Ye (Hydrost
KEY POINTS IN DIMENTIONAL ANALYSIS
1. WHY DIMENSIONAL ANALYSIS IS IMPORTANT?
To understand
Energy dissipation downstream of a dam
Discharge characteristics of a spillway
Effect of reclamation on the w
KEY POINTS IN DIMENTIONAL ANALYSIS
1. WHY DIMENSIONAL ANALYSIS IS IMPORTANT?
To understand
Energy dissipation downstream of a dam
Discharge characteristics of a spillway
Effect of reclamation on the w
Examples in Fluid Kinematics
Example 1
Air flows through a 1-km long one-way vehicle tunnel. The cross section of the tunnel is a
semi circle with diameter 10 m. In the inlet side, air flows into the
Tutorial 2: Fluid Kinematics
1.
A fluid flow is described by the velocity field
U 5x 3i 15x 2 yj tk
Estimate the velocity and acceleration components at the point (1, 2, 3) at t = 1.
2.
The velocity o
September-December, 2017 A. W. Jayawardena
Measurements of surface elevation
Point gauge
Hook gauge
Sonar
September-December, 2017 A. W. Jayawardena
Measurement of pressure
Static pressure pressur
September-December, 2017
A. W. Jayawardena
Kinetic Energy Correction Factor
When flows in open channels or pipes are
considered, it is generally assumed to be one-
dimensional with an average velocit
CAES9540 Technical English for Civil Engineering 2017/18
Unit Seven
Writing an abstract/summary, front and back matters,
and practising the question and answer session
Overview
This unit aims to sharp
CAES9540 Technical English for Civil Engineering 2017/18
Unit Six
Writing and delivering a conclusion, reflecting on difficulties,
future plan of work
Overview
A conclusion is not merely a descriptive
CAES9540 Technical English for Civil Engineering 2017/18
Unit Three
Writing and delivering an introduction, and designing
visual aids
Overview
An effective introduction is crucial in attracting your a
Tutorial No. 3: Governing equations of fluid flow
1.
Water flows in a horizontal rectangular channel. The water depth is 0.3 m and the flow
speed is 0.5 m/s uniformly over the depth. The flow passes o
Fluid Mechanics (CIVL2103)
Model Answers for the Quiz on April 28, 2017: 11:30-12:20
1. What are the key differences between forces acting on submerged plane surfaces and
submerged curved surfaces? Wh
Fluid Mechanics (CIVL2103): Model answers for Tutorial No. 6
1. Obtain the stream functions for (i) uniform flow with a velocity of 20 m/s parallel to
the positive direction of x-axis, (ii) uniform fl
DIMENSIONS OF VARIOUS QUANTITIES
Geometrical characteristics
Length
Angle
Area
Volume
L
None
L2
L3
Fluid properties
Mass
Density
Specific weight (g)
Kinematic viscosity
Dynamic viscosity
Elastic modul
CAES9540 Technical English for Civil Engineering 2017/18
Unit One
Course introduction and overview of academic writing
and presentation
Overview
This one semester 6-credit English course is offered to
CAES9540 Technical English for Civil Engineering 2017/18
Unit Two
Paraphrasing, using citation and references; Self-Access
and Reflection Record
Overview
This week will be devoted to three activities:
CAES9540 Technical English for Civil Engineering 2017/2018
Unit Five
Reporting and discussing results, making use of analogies,
figures and graphics
Overview
This unit will help you guide your reader
CAES9540: Civil Engineering
CAES 9540
TECHNICAL ENGLISH FOR
CIVIL ENGINEERING
Unit Six
Writing and delivering a conclusion, reflecting on
difficulties, future plan of work
Overview
A conclusion is not