Steady State Heat Conduction
Nehal I. Abu-Lail
Topics to be covered
Conduction through single wall and multilayer
walls.
Conduction with temperature dependence
Conduction through single hollow cylinder and
multilayer cylinders.
Conduction through sing
Exam 1 solution
ChE 310
Nehal I. Abu-Lail
Problem 1: Dimensions and units
A seed crystal of diameter D (mm) is placed in a solution of dissolved salt and new crystals are
observed to nucleate (form) at a constant rate r (crystals/minute). Experiments with
Forced Convection Heat
Transfer Outside Geometries
Nehal I Abu-Lail
Fluid often flows over completely immersed bodies such as
spheres, tubes, or plates.
Heat transfer occurs between solid and fluid only.
Heat flux depends on (geometry of the submerged
Special Heat Transfer Coefficients
4.13C Extended Surfaces or Finned Exchangers
Nehal I. Abu-Lail
How to increase q at fixed T1 and T2?
Newtons law of cooling states that:
qconvection=hA(T1-T2)
We either increase h (forced convection) or A (using
fins)
Review of Chemical Kinetics
Chemical kinetics, also known as reaction kinetics, is the study of rates of chemical processes.
Chemical kinetics includes investigations of how different experimental conditions can influence
the speed of a chemical reaction
Recitation 12-10-14
Unsteady state Mass transfer
Problem 7.1-6 Drying of Wood. A flat slab of Douglas fir wood 50.8 mm thick containing 30 wt%
moisture is being dried from both sides (neglecting edges and ends). The equilibrium moisture
content at the sur
Chapter 4
Principles of Steady-State Heat
Transfer
Nehal I. Abu-Lail
Thank you
Jordan University of Science and Technology
Dr. Sameer Al-Asheh
Dr. Mohammad Al-Saleh
Dr. Fahmi Abu Al-Rub
Google images
Announcements
I will be emailing PDF files of PPTs
Radiation
Nehal I Abu-Lail
Radiation Heat Transfer
Radiation is the energy emitted by matter in the form of
electromagnetic waves as a result of the changes in the electronic
configurations of the atoms or molecules.
In heat transfer studies, we are inter
Natural Convection
Nehal I. Abu-Lail
Natural or Free Convection
A solid is in contact with gas or liquid at a
different T.
in the fluid arising from heating near
solid surface provide the buoyancy force
required to move the fluid.
Natural convection is
Relationships for mass transfer coefficients for different geometries
Chapter 7.3
Geometry
Flow inside a pipe
Equation
Mass flow inside surfaces
Chart 7.-3-2 for laminar flow for
liquids and gases
Liquid flow inside pipe
Laminar
W
c A c Ao
= 5 .5
c Ai
1
Chapter 7
Principles of Unsteady State
and Convective Mass Transfer
Nehal I. Abu-Lail
Introduction
2
In previous chapter, we dealt with mass transfer systems at
steady-state (no change of concentration, pressure, etc with
time)
Typically, in all chemica
Unsteady State Heat Conduction
in Various Geometries
Nehal I. Abu-Lail
Introduction
Previously, internal resistance (Ri) of a solid with
high conductivity was ignored and as such
temperature was uniform within the solid.
Here, we will go with the genera
Transport Phenomena (ChE 310)
Nehal I. Abu-Lail
Recitation# 3
9-28-2016
Problem 1: Flow between two-parallel horizontal plates with the bottom plate moving
Two horizontal plates with infinite length and width are separated by a distance H in the z-directi
First ChE 310 exam solution
Nehal I. Abu-Lail
Problem 1: One compartment model of the fluid of a patient undergoing dialysis (8 point)
The pool of fluid in the body of a patient undergoing dialysis can be modeled as a single
compartment system with a tota
Print Name _
ChE 310 Quiz #2 solution
Thursday, September 1st 2016
Three different liquids are used in the manometer shown to the side.
a. Derive an expression for P1-P2 in terms of A, B, C, h1 and h2?
b. Suppose fluid A is methanol (A=0.7918
g/cm3), B is
Transport Phenomena (ChE 310)
Nehal I. Abu-Lail
Recitation # 2 Solution
Problem 1: Manometers
A fluid of unknown density is used in two manometers-one sealed-end, the other across an
orifice in a water pipeline. The readings shown here are obtained on a d
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ChE 310 Quiz #3-Fulmer
Thursday, September 15th 2016
A Newtonian fluid with constant and is flowing between two parallel, horizontal plates located
at y=h. The flow is driven by a constant positive pressure gradient, K, in the x-direction. In
Print Name _
ChE 310 Quiz #3-ETRL
Thursday, September 15th 2016
A Newtonian fluid with constant and is flowing between two coaxial cylinders due to a constant
positive pressure gradient, K, in the z-direction. In addition to the above, the inner cylinder
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ChE 310 Quiz #1
Thursday, August 25th 2016
1) When a black body is heated to a temperature (T, K), photons
are emitted from the surface which have a definite distribution of
energies. Plancks equation relates the emissive power E Bin
W/m3 to
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ChE 310 Quiz #2
Thursday, September 1st 2016
Manometers
A fluid of unknown density is used in two manometers-one sealed-end, the other across an
orifice in a water pipeline. The readings shown here are obtained on a day when barometric
pressu
Molecular Diffusion Plus
Convection and Chemical Reactions
Nehal I. Abu-Lail
2
Table 7.5-1
Different Types of Fluxes
Molar and Mass Fluxes
Flux Relative to
Fixed Coordinate
Molar Flux
(kg mol/m2.s)
Mass Flux
(kg/m2.s)
N A cA A
nA A A
Molar avg. velocity (
Convective Mass Transfer
1
Previously, molecular diffusion in stagnant fluids or fluids in laminar flow was
considered.
In many cases, the rate of diffusion is slow. A more rapid process is desired.
To do this, fluid velocity is increased until turbulent
1
Mass Transfer Coefficients For Various
Geometries
Nehal I. Abu-Lail
Analogy Between Mass, Heat and Momentum
2
Previously we said that there are many similarities between Momentum, Heat
and Mass transfer in both molecular and turbulent transport (t, M, t
Study Guide for Test One
ChE 310: Introduction to Transport Processes
Materials that you are responsible to study:
1. Lectures between 8/ ~ / (You are not responsible for Unsteady State Energy
Transport Problem for Test I).
2. HW#1~HW#
3. Quiz#1
4. All re
Study Guide for Test Two
ChE 310: Introduction to Transport Processes
Your exam will be closed book and closed notes. You can bring one note card (standard
size: no larger than 7 x 8) for the exam.
I. Materials that you are responsible to study:
1. Lectur
Study Guideline for ChE 310 Final Exam
Your final exam will be closed book and closed notes. You can bring three note cards
(standard sizes: no larger than x ) for the final exam.
1. Differences between molecular and convective transport for the energy, m
Part Three: The sketchshowsa copperpyrimid which i$ heated y an electeicalheator
b
andgenerates uniform energy,(Q"Dv(unitsof energy/vo1+ime), oth its Width and
a
B
Length increasen a positivo z-directionaccordingto following relationship:
i
\ilidth = 2z
L