×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# What is the link between Reynolds number and heat transfer coef.

## What is the link between Reynolds number and heat transfer coef.

(OP)
For my diploma exam I did my research in a program named HTRI. I have a heat exchanger with hot TAME in the shell and cold water in the tubes. I noticed that the Reynolds number and heat transfer coef graphs have almost the same shape
http://files.engineering.com/getfile.aspx?folder=4...
Is there something like a rule or it's just a coincidence?

### RE: What is the link between Reynolds number and heat transfer coef.

(OP)
Sorry the pictures got uploaded wrong. Here they are http://imgur.com/a/sVoDf

### RE: What is the link between Reynolds number and heat transfer coef.

Increasing Rn usually corresponds to increasing mass flow. Heat transfer also increases with mass flow.

You might notice some differences at very low Rn when convection heat transfer becomes more dominate than conduction heat transfer.

you must get smarter than the software you're using.

### RE: What is the link between Reynolds number and heat transfer coef.

Normally the higher the turbulence, the better the heat transfer coefficient. Look up a heat exchanger "turbulator"

(OP)

### RE: What is the link between Reynolds number and heat transfer coef.

In turbulent flow, film coefficients vary as Re^0.8. In laminar flow, what it works out to is that you need the same area irrespective of tube diameter. But exchanger performance is complex- there are a lot of factors at play, and what matters most is which resistances to heat transfer are controlling.

### RE: What is the link between Reynolds number and heat transfer coef.

All transfer (heat, mass, momentum) is proportional to turbulence.

### RE: What is the link between Reynolds number and heat transfer coef.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!