Mathcad Functions for

Natural (or, free)

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 Natural (or, free) 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 and Mass Transfer: 3rd Ed. McGraw Hill Co.,

3. Incropera , Dewitt, Bergman, Lavine: Fundamentals of Heat

and Mass Transfer, 6th Ed., Wiley Intl.

4. Cengel, Y. A. and Ghajar, A. J., Heat and Mass Transfer -

Fundamentals and Applications, 5th Ed., McGraw-Hill, New

York, NY, 2014.

5. 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

6. 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 Natural (or Free)

convection heat transfer calculations:

Contents:

2A2.1 Natural convection formulas:

Problems:

2A2.2 Natural convection from vertical plates, cylinders:

Now, write Mathcd Functions for properties of Water:

And:

2A2.3 Natural convection from enclosed spaces:

For Air:

For Air:

2A2.4 Natural convection from rotating cylinders..etc.

2A2.5 Natural convection from finned surfaces:

2A2.6 Combined Natural and Forced convection:

Mathcad Solution:

First, write Mathcad Functions for properties of CO2:

Extract each property as a vector:

Now, write the Functions:

Now, solve the Problem: