What is Good Mixing?

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• Webinar Summary
• Hear from the Experts
• Support & Troubleshooting
• Questions?


 Webinar Summary: 

The purpose of this webinar is to help engineers and scientists recognize the differences between “good” and “bad” mixing. Mixing is not just one operation, but different aspects of fluid motion depending on the application and process objectives. Mixing may mean blending for uniform properties; intense local turbulence to promote chemical reaction; off-bottom suspension of solids for dissolution; dispersion of a gas for mass transfer; complete motion of a viscous fluid; or dispersion of immiscible liquid to form an emulsion. Describing “mixing” in real process objectives is important to understand how to achieve “good” mixing.

All liquid mixing involves flow patterns. Some flow patterns are incorrectly thought to represent “good” mixing. A strong surface vortex is usually a sign of poor mixing. An up-pumping impeller is not good for suspending solids. Different types of impellers work better in certain situations. Seeing flow patterns can be an aid in understanding “good” mixing.

Mixing has many differences. No one type of fluid motion or mixing equipment works in all applications. Understanding flow patterns can help establish ways to improve mixing. Mixing can be a solution to a problem or an opportunity for improvement. Understanding what works and what does not is an essential part of doing “good” mixing.

 
 

Viewers Will Learn:

  • The different meanings of “mixing”
  • How to better describe the mixing processes
  • The different types of fluid motion that contribute to mixing
  • Observe different flow patterns
  • Why a surface vortex is usually a sign of poor mixing
  • The importance of the vertical component of a mixing flow pattern
  • The different circulation patterns in solids suspension through video demonstration
  • The best uses for different impeller types
  • The three factors that describe the size requirements for a mixer
  • Some differences between power, torque, and tip speed for mixing performance
  • Some of the limitations of computer models
  • Some of the most common errors in mixing
 

Who Should Attend:

  • Engineers, scientists, and technicians who use mixing in process, pilot plant, and laboratory applications will learn about flow patterns that contribute to “good” mixing.
  • Technical people who lack an education in mixing and need a better understanding of what works and what does not.
  • Those people who have problems with mixing and need additional information or guidance will appreciate these basic insights into mixing.
  • Engineers, scientists, and technicians who have new responsibilities for mixing processes or who have existing process problems.

 

Hear from these experts: 


 
 

Dave S. Dickey, Ph.D.
Senior Consultant
MixTech, Inc.

David Dickey started his own consulting business called MixTech, Inc. in 1998. Since then he has done independent consulting work to solve process and mechanical problems with various types of mixing equipment. Several companies have had him write specifications for new mixers or evaluate existing mixers. He teaches short courses on liquid mixing, powder blending, mixing scale-up, and advanced mixing through the Department of Engineering Professional Development, University of Wisconsin, Madison. He has also served as an expert witness in important litigation cases involving mixing equipment.

Before starting his consulting business he had more than thirty years experience with manufacturers of various types mixing equipment, including almost fifteen years experience with Chemineer, a major manufacturer of fluid agitation equipment in Dayton, OH. He coauthored articles in the Refresher Series on Liquid Agitation that they published in Chemical Engineering magazine in 1975 and 1976. As Technical Director for Chemineer, he did customer seminars, developed mixer design procedures for new processes, aided in customer lab tests with scale-up to process size mixers, and helped develop their successful HE-3 hydrofoil impeller. During other parts of his career at Chemineer he managed technical sales and product engineering.

David also worked for Patterson-Kelley in East Stroudsburg, PA, an important manufacturer of dry-solids mixers and other chemical process equipment. He designed and marketed pilot plant reactors and systems for American Reactor Corporation. He also worked for Robbins & Myers with technical and management responsibility for their Prochem Mixers division. His diversity of experience has helped him understand the importance of mixing to the overall success of many chemical and biological processes.

   

 

Moderator:


 
  Scott Jenkins
Senior Editor
Chemical Engineering magazine

 

Scott Jenkins has been an editor at Chemical Engineering since 2009. Prior to joining CE, Scott worked in various capacities as a science journalist and communications specialist, reporting and writing on a variety of sectors, including chemical processing, biotechnology, pharmaceutical manufacturing and research policy. He also has industry experience as a quality assurance chemist and research experience as a synthetic organic chemist. Scott holds a bachelor's degree from Colgate University, and a master's degree in chemistry from the University of North Carolina at Chapel Hill.

   



 

What do I need to view this Webcast?

Minimum Requirements:

Operating System Processor RAM Internet Browser Hardware Media Players Internet Connection

Windows 8 Pro

Windows 7
Widows Vista

Windows XP SP3
Android 4.3+

Apple Mac OS X 10.6 Snow Leopard
Apple iOS 5.1+

1 GHz1 1 GB

Internet Explorer 7.0+ 

Firefox 4.0+

Safari 5+

Google Chrome
10+

AUDIO: Sound Card with speakers

VIDEO: Monitor with 1024x768+ resolution support

Adobe Flash Player 10.3+2
Apple iOS http streaming enabled browser3

Android http streaming enabled browser
4

Dedicated high speed connection of 700kbps+


1
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2 In addition to having a properly installed Adobe Flash Player your system must permit live Flash streaming.

3 Apple iPad and iPhone only.  Please use Safari on iOS devices for the best viewing experiences.

4 Android 4.3+.  Please use Chrome on Android devices for the best viewing experience.


Support & Troubleshooting


What support is available for users on Macintosh and Unix/Linux-Based operating systems?
This presentation incorporates advanced multimedia features that allow elements such as slides, polling questions, surveys, and application demonstrations to be dynamically sent to the audience synchronized with the presentation. Mac and Linux audiences may view the presentation using a supported Firefox Web browser and Adobe Flash playerPlease note that some presentations may not feature a Flash option. 

Why can't I hear audio?

  • If you have internal speakers, make sure they aren't muted.
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  • Make sure you did not lose Internet connectivity.
  • Make sure your system has passed the system test located under "Test my system now".
  • If your system is using Adobe Flash Player and you receive a "connection failed" message it's most likely due to a proxy server blocking Flash streaming. Please contact your local IT admin.
  • If you are using a mobile device, such as an iPhone, make sure you have enough bandwidth. We advise using dedicated wi-fi or 4G.
  • If you are using an Android device, Apple iPad or iPhone you will need to click on the media play button to begin the presentation. Android and Apple iOS devices do not permit streams to begin automatically.
  • If you are using a PC or Mac please ensure that your browser zoom level is set to 100% as the presentation is best viewed at that setting. In most browsers you can use Ctrl + 0 to reset your zoom level. This option can be also be found in the tools or view menu.
What is a pop-up blocker and how do I disable it?

Pop-up blockers are software programs that stop unsolicited "pop-up" browser windows from launching automatically. These windows often feature advertisements that can be an annoyance to users trying to browse the Internet, however some features of the Webcast may make use of pop-up windows to deliver key functionality. Depending on the software progam you have installed you may be able to add the Web site URL to a list of permissible Web sites where pop-up windows are allowed. 

It is common to have one or more pop-up blockers that you may be unaware of. Most pop-up blockers reside either in the system tray (lower right hand corner of your screen by the clock) or as a toolbar in Internet Explorer (at the top of your browser, go to "View" and then "Toolbars"). These can be disabled in their options or preferences menus. (Common toolbars such as Google and Yahoo Companion have built in pop up blockers). 

Also, if you are unaware of any other pop-up blockers that are running on your computer, you may want to see if you have personal firewall software running, such as Norton's Internet Security or ZoneAlarm. If you have either of these, they will also block pop-up windows. 

Where can I download the latest streaming media players?

- Adobe Flash (for viewing Application Demonstrations and Video Roll-ins) - http://get.adobe.com/flashplayer/

Where can I download the latest Internet browsers?

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- Previous versions of IE - http://www.microsoft.com/windows/ie/ie6/downloads/default.mspx
- Firefox - http://www.mozilla.com/firefox/

I occasionally hear a clicking noise during the presentation. How do I turn it off?

  • Windows 7 - Click on the Windows Start icon, then choose "Control Panel" > "Sound," > "Sounds" tab. Scroll down the "Program" menu until you reach "Start Navigation." Set the sound to [None] and click "OK." The clicking will be disabled.
  • Windows Vista - Click on the Windows Start icon, then choose "Control Panel" > "Sound," > "Sounds" tab. Scroll down the "Program" menu until you reach "Start Navigation." Set the sound to [None] and click "OK." The clicking will be disabled.
  • Windows XP - You can disable this noise by going to the Start menu, then "Control Panel". Open "Sounds and Audio Devices," and click the "Sounds" tab. Scroll down the "Program Events" menu until you reach "Start Navigation." Set the sound to [None] and click "OK." The clicking will be disabled.
Why do I get a "connection failed" or "connection blocked" message when I try to view Adobe Flash streams?

In addition to having a properly installed Adobe Flash Player your pc must permit rtmp (over port 1935) and / or rtmpt (over port 80) live streaming protocols. Please contact your local IT Administrator if you are unsure of your settings. IT Admins can click here to review additional information on configuring proxy servers to permit live Flash streaming. 


Questions?


Please contact Cristane Martin, Marketing Manager, at cmartin@accessintel.com

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