Exam review Chapters 6-9
Problem 8.80
Problem 6.5: For laminar flow over a flat plate, the
local heat transfer coefficient hx is known to vary as
x-1/2, where x is the distance from the leading edge (x
= 0) of the plate. What is the ratio of the average
c
6-39 The oil in a journal bearing is considered. The velocity and temperature distributions, the maximum
temperature, the rate of heat transfer, and the mechanical power wasted in oil are to be determined.
Assumptions 1 Steady operating conditions exist.
H.W chapter 2 solution
2-45 Heat conduction through the bottom section of a steel pan that is used to boil water on top of an electric
range is considered (Fig. P2-45). Assuming constant thermal conductivity and one-dimensional heat transfer, the
mathemat
12/5/2012
Chapter 7: External Forced
Convection
Objectives
When you finish studying this chapter, you should be
able to:
Distinguish between internal and external flow,
Develop an intuitive understanding of friction drag and
pressure drag, and evaluate
12/5/2012
Chapter 8: External Forced
Convection
Objectives
When you finish studying this chapter, you should be able to:
Obtain average velocity from a knowledge of velocity profile, and
average temperature from a knowledge of temperature profile in
inte
12/5/2012
Chapter 9: Natural
Convection
Objectives
When you finish studying this chapter, you should be able to:
Understand the physical mechanism of natural convection,
Derive the governing equations of natural convection, and obtain the
dimensionless
9/25/2012
Chapter 4: Transient Heat
Conduction
Objectives
When you finish studying this chapter, you should be able to:
Assess when the spatial variation of temperature is negligible,
and temperature varies nearly uniformly with time, making the
simplifi
9/25/2012
Chapter 3: Steady Heat
Conduction
Objectives
When you finish studying this chapter, you should be able to:
Understand the concept of thermal resistance and its
limitations, and develop thermal resistance networks for
practical heat conduction p
9/25/2012
Chapter 1: Introduction and
Basic Concepts
Objectives
When you finish studying this chapter, you should be able to:
Understand how thermodynamics and heat transfer are related to
each other,
Distinguish thermal energy from other forms of energ
12/5/2012
Chapter 6: Fundamentals of
Convection
Objectives
When you finish studying this chapter, you should be able to:
Understand the physical mechanism of convection, and its
classification,
Visualize the development of velocity and thermal boundary
9/25/2012
Chapter 2: Heat Conduction
Equation
Objectives
When you finish studying this chapter, you should be able to:
Understand multidimensionality and time dependence of heat transfer,
and the conditions under which a heat transfer problem can be
appr
9/25/2012
Chapter 5: Numerical
Methods in Heat Transfer
Objectives
When you finish studying this chapter, you should
be able to:
Understand the limitations of analytical
solutions of conduction problems, and the need
for computation-intensive numerical m
Internal Combustion Engines
ME:402331
Chapter 1
Introduction To Internal Combustion Engines
Dr.Mohammad Al-Tarawneh
ENGINE CLASSIFICATIONS
Types of Ignition. 1
Spark Ignition )SI( a)
An SI engine starts the combustion
process in each cycle by use of a spa
Fuel Injection System
Fuel Injection System
Uses pressure (not Vacuum) from an
electrical pump to spray fuel into the
intake manifold.
Provides the engine with proper
air-fuel ratio (14.7 : 1)
Fuel Injection System
Advantages
Improved Atomization
Better f
The Hashemite University
Engineering College
Department of Mechanical
Engineering
Internal Combustion Engines
ME:402331
Chapter 3
Engine cycles
Dr.Mohammad Al-Tarawneh
AIR-STANDARD CYCLES
To make the analysis of the engine cycle
much more manageable, the
Engines
Internal combustion engine needs
fuel, ignition and compression
in order to run.
Four-Stroke Gasoline Engine
Two-Stroke Gasoline Engines
Diesel Engine
Rotary Engine
Steam Engine
Engines
Configuration
Inline Engines: The
cylinders are arranged in
Fuel System
Carburetor
A device that mixes air and fuel
in correct proportion for
efficient combustion.
Stoichiometric Ratio
14.7 : 1 (Air : Fuel)
CFM of air flow:Cubic feet of
air per minute
Fuel System
Venturi
Venturi works on high-low pressure.
As the