Chemical & Process Technology

Tuesday, November 17, 2009

Understand Drop Size in Spraying Technology

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The importance of drop size information has increased considerably during the last decade. Many spray applications such as evaporative cooling, gas conditioning, fire suppression, spray drying and agricultural spraying rely on this information for effective use. It is increasingly important for engineers to understand the basic atomization process and how it is evaluated. Earlier post "Visualize Spraying Nozzle Performance" presented some spray nozzle videos to help in visualizing the performance characteristics of the most common nozzle spray pattern types. In this post, a simple but important booklet may be downloaded to understand further the drop size in spraying technology.

Understand Drop Size
This booklet is designed to provide engineers with a working knowledge of drop size and related issues. It begins with a brief introduction to atomization and is followed by sections on drop size sampling techniques (methods available for capturing data) and drop size analyzers (methods available for recording data). Sections 4, 5 and 6 discuss the statistics and terminology used in drop size data analysis. Several drop size distribution functions and drop size mean diameter terms are defined and discussed. Factors affecting drop size distribution are discussed in Section 7. Section 8 reviews several forms of drop size data such as graphical and tabular and how data is used. Section 9 addresses practical considerations to take into account when evaluating drop size data. This section examines various aspects of data interpretation to reduce confusion when reviewing reports. Lastly, Section 10 provides a list of reference materials, suggested reading and information on drop size related organizations.

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Labels: Droplet, Hydraulic

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Tuesday, September 22, 2009

Visualize Spraying Nozzle Performance

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Mixing of liquid in vapor using spraying nozzle is commonly used in reactor, column, mixing tank, etc. Mixing efficiency and effectiveness subject to liquid droplet size and contact time between droplet and vapor. In order to promote mixing efficiency and effectiveness, spraying nozzle is used to create small droplet size, well distribution of droplet and better spraying angle. Spraying liquid can be done hydraulically (high pressure liquid acting on a special design nozzle), gas assisted (gas kinetic energy acting on liquid for break-up) and rotary spraying (hydraulic pressure acting on moving device and results breakage of liquid).

There are several well known spraying nozzle manufacturer such as BETE fog nozzle, Spraying Systems Co., etc Out of all, BETE Fog Nozzle, Inc., a leading supplier of engineered spray nozzle solutions, has posted high-resolution spray videos on their Web site to share with the public. BETE has published video in Youtube so that it can be viewed in public. Besides, BETE also provide embedding code so that publisher can display them in their website. Thanks to BETE.

The spray nozzle videos were created to help customers visualize the performance characteristics of the most common nozzle spray pattern types. The spray nozzle videos will assist customers in selecting nozzles for their application design and process improvements right from their own offices.

Spray pattern videos now available include examples of the following nozzles:

Spiral
Axial Whirl
Tangential Whirl
Fan
Misting
Air Atomizing
Tank Washing

This useful tool is the newest component of BETE Fog Nozzle, Inc.'s efforts to provide customers with solutions specially tailored to their unique spray challenges. BETE Fog Nozzle, utilizing our engineering resources and state-of-the-art Spray Laboratory, is fully prepared to collaborate with customers to supply nozzles that meet their most demanding industrial process conditions.

Following are 5 typical spraying videos.