Newsletter #16


Institute for Liquid Atomization and Spray Systems - North and South America.

Editor: Prof. Rolf D. Reitz
Mechanical Eng. Dept.
University of Wisconsin
Madison, WI 63706

Newsletter # 16 - June, 1993

The Sixth ILASS Conference on Liquid Atomization and Spray Systems was held May 17-19, 1993, at the Worcester Marriott Hotel, Worcester, Massachusetts. The meeting was a great success with a record 154 attendees. Thanks are due to the conference organizers, Jim Peters (Conference Chairman) and Rick Slagle (Local Arrangements Chairman) and Amanda Horner (Conference Coordinator) and Ian Macpherson and Becky Venable. 51 presentation papers and 5 poster papers were given on subjects that included Spray Structure, Agricultural Sprays, Reciprocating Engine Sprays, Instrumentation, Atomization Processes and Spray Modeling. Copies of the book of Paper Abstracts are available from Professor James Peters, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801-2978, Phone: (217) 333-3237 at a cost of $50. The Annual General Meeting of ILASS was also held during the meeting and the minutes of that meeting are given below.

Minutes of ILASS Annual General Meeting held at ILASS-93

May 19, 1992 Worcester, Massachusetts

The Chairman, Professor Norman Chigier, convened the Annual General Meeting at 1:00 PM on Wednesday, May 19, 1993. Professor Chigier announced that ILASS has continued to grow in strength since its inception six years ago. ILASS-93 was attended by a record 154 registrants and there were 48 presentation papers (including 3 invited papers) and 5 poster papers. 9 manufacturers were represented at the industrial exhibits. Over one half of the registrants were from industry, and about one third of the 48 papers were authored or co-authored by members from industry. The Chairman pointed out that this represents an encouraging response to the efforts of the ILASS Board to increase the involvement of industries in ILASS.

A motion was proposed by J. Kennedy (seconded by J. Bellan) to approve the minutes of the previous Annual General Meeting which was held at ICLASS-92 in San Ramon, California on May 20, 1992. The motion was passed unanimously. ILASS treasurer, Dr Jan Kennedy, reported that ILASS-Americas currently holds a balance of $29,830, and that most of this surplus was from the ICLASS-91 conference at NIST. A motion was proposed by G. Smallwood (seconded by C. Lipp) to approve the treasurer's report. The motion was passed unanimously.

The ILASS Bylaws required a change in the Executive Committee at the ILASS-93 Conference. Professor Samuelsen (Chairman of the Nominating Committee) announced that the Nominating Committee recommendations were: Jan Kennedy as ILASS Vice-Chairman, Rolf Reitz as Treasurer, and Chris Edwards as Secretary. A motion to adopt the recommendations of the Nominating Committee was proposed by G. Smallwood (seconded by K. Sherman). The motion was passed unanimously. Under the terms of the Constitution, Professor Samuelsen begins his three year term as ILASS-Americas Chairman, and the past Chairman, Professor Norman Chigier, resumes his position on the ILASS Board.

ILASS Past-Chairman, Professor Chigier, welcomed the new ILASS Chairman. Professor Scott Samuelsen called for a vote of thanks to the Conference Keynote Speakers, W. Dodds, R. Reitz, and S. Londerville. He also thanked Conference Chairman Jim Peters and Local Arrangements Chairman Rick Slagle and Ian Macpherson for organizing the conference. Conference Coordinator Amanda Horner and Becky Venable were also thanked for their help.

Professor Scott Samuelsen acknowledged the outstanding contributions of Professor Norman Chigier to ILASS and his activities as Editor of the Atomization and Sprays Journal. He pointed out that Professor Chigier will continue to be a major resource to ILASS through his role as Chairman of ICLASS.

Professor Samuelsen announced that ILASS-94 would be held on May 16-18, 1994 on the west coast, possibly at the University of Washington. Professor Jim Peters will serve as the Program Chairman.

The Chairmen of the eight ILASS Technical Committees which met on Monday, May 17 and Tuesday May 18, then made their presentations (summaries of these reports are included in the Appendix).

The Annual General Meeting was adjourned at 1:30 PM.

Signed _______________________ Rolf D. Reitz, Secretary

ILASS Journal, Atomization and Sprays

The publisher of the Atomization and Sprays Journal has decided to increase the number of issues from four to six per year. This change is necessary to prevent the Journal from falling behind in its publication.

ILASS members who attended the ILASS-93 Conference in Worcester received personal subscriptions to the ILASS Journal Atomization and Sprays . These subscriptions cover the one year period from January 1, 1993 to December 31, 1993. Members are urged to persuade the libraries of their institutions to subscribe to Atomization and Sprays . Annual subscription rates are $35 for ILASS members and $135 for institutional libraries.

ILASS members are also urged to consider the journal, Atomization and Sprays, as the first choice for submission of manuscripts for publication in an archival journal. It has the advantage of being read by all experts in the field and those who are interested in learning about atomization and sprays. Over 130 papers have been submitted to the Journal so far. Three copies of manuscripts should be submitted to the editor, Dr. N. Chigier, Mechanical Engineering Department, Carnegie Mellon University, Pittsburgh, PA, 15213, U.S.A.


In keeping with the tradition of alternating between the East and West coasts for the ILASS-Americas annual conferences, the next meeting is to be held in Seattle, Washington, May 16-18, 1993. The conference organizer will be Professor Jim Peters (Mechanical and Industrial Engineering, University of Illinois, 1206 W. Green Street, Urbana, IL 61801, Phone: (217) 333-3237). The Local arrangements chairman will be John Kramlich, Department of Mechanical Engineering, University of Washington, Seattle, WA. Papers and posters will be solicited on subjects dealing with atomization and spray processes for this meeting. Abstracts should be submitted to Jim Peters.

ASTM E29.04 Subcommittee

The ASTM E29.04 Subcommittee on Liquid Particle Characterization meeting was held in conjunction with the ILASS-93 conference at the Worcester Marriott starting on Thursday , May 20 and concluding on Friday, May 21. The next meeting will be held at the Keller Conference Center of Penn State University on November 18-19, 1992. Contact Committee Chairman Thomas Bassett (Bete Fog Nozzle, Inc., 324 Wells Street, Greenfield, MA 01301 Phone: (413) 772-0846 for details about the meeting.


The sixth International Conference on Liquid Atomization and Spray Systems (ICLASS-94) will be held in Rouen, France, July 18-22, 1994. The Conference is being organized by Professor M. Ledoux, Dr Christophe Dumouchel and Papers Chairman, Professor Andrew Yule. The meeting will be held at the Palais des Congres that is located in one of the most beautiful parts of the city center. Paper Abstracts were due to Andrew Yule (Department of Mechanical Engineering, P.O. Box 88, Manchester, M60 1QD, United Kingdom) by June 30, 1993. The full version of accepted papers will be due by November 30, 1993. To be placed on the mailing list for ICLASS-94 contact: Dr. Christophe Dumouchel, Universite de ROUEN, URA 230/CORIA, BP 118-76 134 Mont-Saint-Aignan Cedex, France (e-mail: phone: (33) 35 14 65 60, fax: (33) 35 70 83 84). ILASS-Americas members are encouraged to submit papers and participate in ILASS-Europe and ICLASS conferences.


Professor A. H. Lefebvre and Dr. J. S. Chin were awarded the William Robert Marshall award for there paper at ILASS-92 entitled "Flow Regimes in Effervescent Atomization". This award is in memory of Dr. Marshall (1916-1988) who made many contributions to the field of sprays. The awards were made during the banquet at ILASS-93.


Report of ICLASS Chairman, Norman Chigier's round-the-world tour:

Israel, May 19-31;
Italy, June 1-6;
Taiwan, June 9-15;
Japan, June 15-18;
China, June 18-27;
Korea, June 28-29;
Japan, June 29-July 2.


Edited Minutes of ILASS Technical Committee Reports

Physics of Atomization (15 Attendees - Chairman N. Chigier)

The technical committee planned to meet once year at ILASS-Americas conferences to provide a forum for discussion of technical details of interest to the members. It was decided that one of the objectives of the committee would be to write "position papers" and to develop a strategic plan for research, development and applications. The proceedings of the NSF Workshop, "Atomization and Sprays 2000" was cited as an example that provides a good basis for discussion and development of future trends. The chairman undertook to distribute reports of discussions to members of the committee and to prepare position papers, and an outline of the strategic plan for research.

The committee members introduced their research topics and discussed general areas in need of further research. These included: the non-linearity of the breakup process and the fact that a steady injection can lead to unsteady sprays - with pulsations and clustering of drops; the physics of high velocity air interactions with liquid surfaces; the need for more information on drag coefficients; the need to develop new instruments with increased accuracy, reliability and precision; the need to provide modelers with benchmark data; and the need for improved terminology.

Finally, committee members were urged to seek out other specialists or interested persons to become members of the committee.

Spray Measurements (24 Attendees - Chairman S. Samuelsen)

The purpose of this committee is to provide a forum for members interested in spray instrumentation to exchange ideas. Other roles of the committee were also identified: to help establish research priorities; to encourage collaborative research; to help accelerate the acquisition of understanding; to help members to establish contacts; and to stimulate the transfer of technology.

Spray Combustion (18 Attendees - Chairman C. Edwards)

A major objective of the meeting was to develop a strategic plan for the committee. Elements that were suggested for inclusion in the plan were: priorities for research, identification of persons in industry, universities and government with special interests in the research topic, ideas for collaborative research and any other matters of common interest. Also ideas were proposed about ways to improve ILASS Conferences.

The first topic of discussion was whether the Spray Combustion Committee should be merged with other technical committees (e.g., Gas Turbine, Diesel) since many attendees wanted to be involved in more than one technical committee. It was decided that the committee should remain autonomous, and unique roles were identified for the committee.

The second topic concerned industrial participation at the conference. It was suggested that papers should be invited from industry to start each session, and that those papers should establish a tie with applications. These papers should be given a little more time, and more flexibility in the length of the paper abstract. It was suggested that each technical committee organize sessions in its area at ILASS conferences. Another suggestion was to have directed discussions on one or two evenings during the meeting. The topics could be decided on in advance, or selected from facets of interesting papers at the meeting. A moderator would start the discussions, but they would not be another presentation period.

The final topic concerned the role that technical committees could play in summarizing the work presented at ILASS meetings for use by industry, scientists and funding agencies. This would constitute a valuable mini-review of the state of the field.

Spray Modeling (14 Attendees - Chairman J. Bellan)

The modeling group discussed finding ways to interact more with industry, and to promote the interest of government agencies in emerging technologies in sprays modeling. It was felt that one benefit of modeling is that it allows results to be obtained more efficiently, with fewer experimental tests. Another benefit is that the physical understanding obtained from accurate models can be used to extend the ranges of validity of experimental correlations. An important purpose of the modeling group is to help guide industrial participants to find contacts to help them with their modeling problems.

>Gas Turbines (12 Attendees - Chairman J. Kennedy)

Of the members (including 6 who could not attend), 53% were from industry, 33% from universities, and 13% from government. The topics that were discussed included comments about ILASS meetings, comments on the role of the Gas Turbine Committee, the need for communication, areas of research interest and a mission statement.

It was felt that effort should be taken to elevate ILASS to the level of an active Institute. Factors that would be helpful would be to become more industrially oriented and attract more industrial participation, to show more applications in presentations, and to instruct authors about the importance of good abstracts and presentation materials. Also it would be helpful to move the meeting time further away from that of the ASME meeting.

It was also felt that members should be able to have membership on multiple technical committees. Student participation should be encouraged as a means of attracting future members. An abbreviated membership list with members areas of interest should be sent to members to help increase communication.

A mission statement was formulated by the technical committee and it was suggested that this form of mission statement should be considered by all of the technical committees:

_ To develop ILASS-Americas to the level of an institute for the dissemination of gas turbine information to the spray atomization community. To take the importance of ILASS-Americas to the top levels within our own industry.

Diesel (23 Attendees - Chairman R. Reitz)

Time was spent discussing the need to increase the presence of diesel engine research at ILASS and to seek new members, particularly from industry. Government emissions regulations are presenting new challenges to the industry, and this provides increased incentive and opportunities for research in diesel engines. Controlling the fuel injection process was identified as being a key to improving engine performance. One method of reducing soot emissions, used successfully by the industry in the past, has been to increase the fuel injection pressure. However, materials and durability considerations limit injection pressures to their current levels which are up to 30,000 psi. This indicates the need for new technologies in diesel engines for further emission reductions. The committee discussed novel injector concepts (e.g., the use of effervescent atomizers), and the role of modeling and advanced laser diagnostics in diesel research.

Considerable time was spent discussing the need for cooperation between industry, research laboratories and universities. It was also suggested that the formation of a consortium would be an appropriate mechanism to provide funding for diesel research.

Industrial (22 Attendees - Chairman D. Senser)

The committee spent time organizing a session of both survey and technical papers for ILASS-93. The papers include topics in consumer products, spray painting, agricultural sprays, and nozzle manufacture.

Agricultural Sprays (?? Attendees - Chairman A. Hewitt)

The purpose of this committee is to provide a forum for members interested in agricultural sprays to exchange ideas. Other roles of the committee were also identified: to help establish research priorities; to encourage collaborative research; to help accelerate the acquisition of understanding; to help members to establish contacts; and to stimulate the transfer of technology.