mathcad functions for forced convection heat transfer calculations
TRANSCRIPT
Mathcad Functions for
Forced convection heat
transfer calculations: by
Dr. M. Thirumaleshwar
formerly:
Professor, Dept. of Mechanical Engineering,
St. Joseph Engg. College, Vamanjoor,
Mangalore,
India
Preface:
This file contains notes on Mathcad Functions
for Forced convection heat transfer
calculations. Some problems are also included.
These notes were prepared while teaching Heat
Transfer course to the M.Tech. students in
Mechanical Engineering Dept. of St. Joseph
Engineering College, Vamanjoor, Mangalore,
India.
It is hoped that these notes will be useful to
teachers, students, researchers and
professionals working in this field.
For students, it should be particularly useful to
study, review the subject and solve the home-
work problems.
• M. Thirumaleshwar
• August 2016
References:
1. M. Thirumaleshwar: Fundamentals of Heat & Mass Transfer,
Pearson Edu., 2006. See: https://books.google.co.in/books?id=b2238B-
AsqcC&printsec=frontcover&source=gbs_atb#v=onepage&q&f=false
• 2. Cengel Y. A. Heat Transfer: A Practical Approach, 2nd Ed.
McGraw Hill Co., 2003
• 3. Cengel, Y. A. and Ghajar, A. J., Heat and Mass Transfer -
Fundamentals and Applications, 5th Ed., McGraw-Hill, New
York, NY, 2014.
• 4. Incropera , Dewitt, Bergman, Lavine: Fundamentals of Heat
and Mass Transfer, 6th Ed., Wiley Intl.
• 5. M. Thirumaleshwar: Software Solutions to Problems on Heat
Transfer – Convection – Part-I- Forced convection - 2013
• http://bookboon.com/en/software-solutions-to-problems-on-
heat-transfer-iv-ebook
• 6. M. Thirumaleshwar: Software Solutions to Problems on Heat
Transfer – Convection – Part-II- Natural (or, free) convection –
2013
• http://bookboon.com/en/software-solutions-to-problems-on-
heat-transfer-v-ebook
• 7. Mathcad Functions for fluid properties – useful in convection heat
transfer:
• http://www.slideshare.net/tmuliya/mathcad-functions-for-fluid-properties-for-
convection-heat-transfer-calculations
Mathcad Functions for Forced convection
heat transfer calculations:
Contents:
Forced convection – boundary layer, flow over flat plates, across
cylinders, spheres and tube banks
Problems:
2A1.1 Boundary layer fundamentals, flow across flat plates etc.
Note:
(i) For derivations, see Ref: 5
(ii) For properties of fluids, see Ref: 7
Now, solve the problem:
2A1.2 Flow across cylinders and Spheres:
Let us have the following Table (Ref: Cengel) for reference:
Following is a small Mathcad program to calculate Nusselts No. for cylinder in cross flow:
Nu is written as a function of Re and Pr. Depending on the value of Re, appropriate eqn is chosen to
calculate Nu: >>>> Hilperts eqn: See the Table 7.1 given above:
2A1.3 Flow across tube banks:
Data from Cengel:
2A1.4 Flow inside tubes and ducts:
And,