Tanasawa AwardThe late Professor Yasusi Tanasawa was the one of the world foremost pioneers in the research of liquid atomization. He contributed greatly to this field by ascertaining the characteristics of many different kinds of spray. One of his significant contributions was the Nukiyama‐Tanasawaequation for liquid droplet distribution. In addition, he proposed many different designs for different ways of atomizing. In particular, he was noted for the swirl atomizer.

In 1982, the committee members of the council of ILASS‐International proposed that future conferences should have an international academic award. They suggested that it should be named the Tanasawa Award in commemoration of Professor Tanasawa's important pioneering contributions to the field of liquid atomization and spray systems. They asked Professor Tanasawa's disciples to put the award, including the fund raising, into practice.

The entire funding for the award was donated by the TOYOTA MOTOR Co.Ltd. This is due to the thanks of Dr. Shoichiro Toyoda, who was the former president of TOYOTA MOTORS Co. and is one of Professor Tanasawa's disciples.

Professor Yasusi Tanasawa presented the first winner the award at the Sendai Conference by himself.

The selection committee for the Tanasawa Award has been organized to select the best paper from each previous ICLASS conference. The committee consists of nine members who are nominated from throughout the world. 

The Tanasawa Award consists of the Plaque with Silver Metal, Award Certificate and Prize Award. 

Yasusi Tanasawa1906 October, Born in Tokyo1929 March, BSc. Mechanical Engineering,

the University of Tokyo1929 April, Lecturer of Tohoku University

Thermo Engineering Departmentwith Professor Shiro Nukiyama

1941 July Professor at Aeronautic Department

1965 to 1968 Dean of the College of Engineering

1970 March, Retired from Tohoku University1970 April, Toyota Central Research and

Development Laboratories Ltd.as a President.

1992 July 27. Passed Away

Research Duration1) 1935-1943

* Air Blast Atomization* Atomization with Rotating Disk* Atomization Mechanism* Atomization by Impingement

2) 1944-1945* Swirl Atomizer

* Spray Combustion* Turbo Jet Engine

3) 1945-1970* Atomization Mechanism* Drop Size Measurement* Atomization by Rotating Nozzle* Atomizing Characteristics of Diesel

Nozzle * Atomization by Impingement

4) 1970-1992* Gasoline Injector

Professor Yasusi Tanasawa

Fund: The entire fund to pay for the award was donated by Toyota Motor Co. Ltd.

Administration Committee of the Tanasawa Awarda) Member(at 2012):

Chairman: N. NagaiVice-Chairman: M,AraiMembers: M. Nakayama, N. Araki, M. Yamada, A. Saito T.Inamura, N.Iki

b) Tasks of Administration Committee* Managing Funds* Preparing the Plaque and Certificate* Preparing a check for Prize Money (US$2,000)

Selection Committee of the Tanasawa Award (SCTA)a) Select the best paper at ICLASSb) The chairman of the Tanasawa award selection committee should be

appointed by the president of ILASS-International.c) Committee member shall total 10, to include the chairman and 3 members

nominated from each of ILASS-Americas, ILASS-Asia, and ILASS-Europe.d) The selection committee is a closed committee.e) Only, the chairman of the selection committee is open.

The Tanasawa Award Committees

Chairmen of Selection Committee1. K. Kobayasi (1982-1988，at Tokyo, Japan， Madison, USA

and London, England)2. N. Chigier (1988-1991，at Sendai, Japan)3. S. Zanelli (1991-1994，at Gaithersburg, USA)4. H. Hashimoto (1994-1997，at Rouen, France)5. J. Kennedy (1997-2000，at Seoul, Korea)6. A. Yule (2000-2003，at Pasadena, USA)7. H. Fujimoto (2003-2006，at Sorrento, Italy)8. W. D. Bachalo (2006-2009，at Kyoto, Japan)9. Christophe Domouchel (2009-2012，at Vail)10. Jiro Senda (2012-2015，at Heidelberg)

Chairman of Selection Committee

1) Tokyo(1978)“Injection Valve of Swirl Flow Type used for Electronic Fuel Injection”by Y. Tanasawa, N. Muto and A. Saito

2) Madison(1982)“The Relationship between Atomization Characteristics and Spray Flame Structures”

by R. Bolado and A. J. Yule3) London(1985)

“The Mechanics of High Speed Atomization”by F. Ruiz and N. Chigier

3) London(1985)“Atomization Characteristics of Superheated Liquid Jets”by N. Nagai, K. Sato and C.W. Lee

4) Sendai(1988)“Advances in Diagnostics for Complete Spray Characteristics”by W. D. Bachalo, A. B. DeLaRosa and R. C. Rudoff

5) Gaithersburg(1991)“Application of Poisson Statistic to the Problem of Size and Volume Flux Measurement byPhase Doppler Anemometry”by C.F. Edwards and K.D. Marx

6) Rouen(1994)“Study on Wave Motion and a Breakup of Annular Liquid Sheet in a Gas Stream”by H. Hashimoto, S. Kawano, H. Togari, A. Ihara, T. Suzuki and T. Harada

Winners of Tanasawa Award (1)

7) Seoul(1997)“Characterization of Liquid-Liquid Mixing in Sprays using Rainbow Refractometry”by S. V. Sankar, D. M. Robart and W. D. Bachalo

8) Pasadena(2000)“Investigation of Internal Flow in Transparent Diesel Injection Nozzles Using Fluorescent Particle Image Velocimetry (FPIV)”by C. Tropea, J. K. Scaller, R. Wirth and J. Walher

9) Sorrento(2003)“Detailed Analysis of Spray Structure Air Entrainment in GDI Sprays Using a TomographicApproach”by C. Seibel, K. Gartung, S. Arndt and B. Weigand

10) Kyoto(2006)“The Influence of Surfactants on Impacting Drops”by A. Rozhkov, B.Prunet-Foch, M. Vignes-Adler

11) Vail(2009)“Ultra-fast Structured Laser Illumination Planar Imaging (SLIPI) for single-shot imaging of dense sprays”by K,Kristensson, E.Berrocal, M.Richter, M.Alden

12) Heidelberg(2012)to be opened at ICLASS-2015

Winners of Tanasawa Award (2)

Professor Yasusi Tanasawa

1906 October, Born in Tokyo1929 March, BSc. Mechanical Engineering,

the University of Tokyo1929 April, Lecturer of Tohoku University

Thermo Engineering Departmentwith Professor Shiro Nukiyama

1941 July Professor at Aeronautic Department

1965 to 1968 Dean of the College of Engineering

1970 March, Retired from Tohoku University1970 April, Toyota Central Research and

Development Laboratories Ltd.as a President.

1992 July 27. Passed Away

1) 1935-1943* Air Blast Atomization* Atomization with Rotating Disk* Atomization Mechanism* Atomization by Impingement

2) 1944-1945* Swirl Atomizer* Spray Combustion* Turbo Jet Engine

3) 1945-1970* Atomization Mechanism* Drop Size Measurement* Atomization by Rotating Nozzle* Atomizing Characteristics of Diesel

Nozzle * Atomization by Impingement

4) 1970-1992* Gasoline Injector

Prof. Yasusi Tanasawa (Research Duration)

Nukiyama- Tanasawa Equation

1

1BA

32

4 13B x

1938Nukiyama, S. and Tanasawa, Y., “Experiments on the Atomization of Liquids in an Air Stream I”, Trans. Soc. Mec.Engrs., Japan, Vol.4, No.14(Feb.1938), pp.86-93

expndnf x Ax Bxdx

expvdvf x A x B xdx

Hole Nozzle

0.250.251 4

321

47 1 3.31

a

Dx gv D

3 0

32 32 32

13 5 3 0.x x xdv . exp . d

x x x

1954Tanasawa, Y., and Toyoda, S., “On the Atomizing Characteristics of High-Speed Jet I”, Trans. Soc. Mec. Engrs., Japan, Vol.20,No.92 (Apr. 1954), p.299

The Tanasawa Award

The entire fund to pay for the award was donated byToyota Motor Co. Ltd.

Administration Committee of the Tanasawa Awarda) Member(at 2012):

Chairman: N. NagaiVice-Chairman: M,AraiMembers: M. Nakayama, N. Araki, M. Yamada, A. Saito

T.Inamura, N.Ikib) Tasks of Administration Committee

* Managing Funds* Preparing the Plaque and Certificate* Preparing a check for Prize Money (US$2,000)

Selection Committee of Tanasawa Award

Selection committee of the Tanasawa Awarda) Select the best paper at ICLASSb) The chairman of the Tanasawa award selection

committee of should be appointed by the president of ILASS-International.

c) Committee member shall total 10, to include the chairman and 3 members nominated from each of ILASS-Americas, ILASS-Asia, and ILASS-Europe.

d) The selection committee is a closed committee.e) Only, the chairman of the selection committee is open.

Past Chairman of Selection Committee

Past Chairmen of Selection Committees were:1. K. Kobayasi (at Tokyo, Japan, Madison, USA

and London, England)2. N. Chigier (at Sendai, Japan)3. S. Zanelli (at Gaithersburg, USA)4. H. Hashimoto (at Rouen, France)5. J. Kennedy (at Seoul, Korea)6. A. Yule (at Pasadena, USA)7. H. Fujimoto (at Sorrento, Italy)8. W. D. Bachalo (at Kyoto, Japan)9. Christophe Domouchel (at Vail)10. Jiro Senda (at Heidelberg)11. Marcus Hermann (at Tainan)

Past the Tanasawa Award Winners(1)

１） Tokyo(1978)“Injection Valve of Swirl Flow Type used for Electronic Fuel Injection”by Y. Tanasawa, N. Muto and A. Saito

2) Madison(1982)“The Relationship between Atomization Characteristics and Spray Flame Structures”by R. Bolado and A. J. Yule

3) London(1985)“The Mechanics of High Speed Atomization”by F. Ruiz and N. Chigier

3) London(1985)“Atomization Characteristics of Superheated Liquid Jets”by N. Nagai, K. Sato and C.W. Lee

4) Sendai(1988)“Advances in Diagnostics for Complete Spray Characteristics”by W. D. Bachalo, A. B. DeLaRosa and R. C. Rudoff

Past the Tanasawa Award Winners(2)5) Gaithersburg(1991)

“Application of Poisson Statistic to the Problem of Size and VolumeFlux Measurement by Phase Doppler Anemometry”by C.F. Edwards and K.D. Marx

6) Rouen(1994)“Study on Wave Motion and a Breakup of Annular Liquid Sheet in aGas Stream”by H. Hashimoto, S. Kawano, H. Togari, A. Ihara, T. Suzuki and T. Harada

7) Seoul(1997)“Characterization of Liquid-Liquid Mixing in Sprays using RainbowRefractometry”by S. V. Sankar, D. M. Robart and W. D. Bachalo

8) Pasadena(2000)“Investigation of Internal Flow in Transparent Diesel Injection Nozzles Using Fluorescent Particle Image Velocimetry (FPIV)”by C. Tropea, J. K. Scaller, R. Wirth and J. Walher

9) Sorrento(2003)“Detailed Analysis of Spray Structure Air Entrainment in GDI Sprays Using a Tomographic Approach”by C. Seibel, K. Gartung, S. Arndt and B. Weigand

Past the Tanasawa Award Winners(3)10) Kyoto(2006)

“The Influence of Surfactants on Impacting Drops”by A. Rozhkov, B.Prunet-Foch, M. Vignes-Adler

11) Vail(2009)“Ultra-fast Structured Laser Illumination Planar Imaging (SLIPI) for single-shot imaging of dense sprays”by K,Kristensson, E.Berrocal, M.Richter, M.Alden

12) Heidelberg(2012)“Nozzle Geometry Effects on Primary Atomization”by Marco Arienti and Mark Sussman

Past the Tanasawa Award Winners

1) Tokyo(1978): “Injection Valve of Swirl Flow Type used for Electronic Fuel Injection”by Y. Tanasawa, N. Muto and A. Saito

2) Madison(1982): “The Relationship between Atomization Characteristics and Spray Flame Structures”by R. Bolado and A. J. Yule

3) London(1985): “The Mechanics of High Speed Atomization”by F. Ruiz and N. Chigier

3) London(1985): “Atomization Characteristics of Superheated Liquid Jets”by N. Nagai, K. Sato and C.W. Lee

4) Sendai(1988): “Advances in Diagnostics for Complete Spray Characteristics”by W. D. Bachalo, A. B. DeLaRosa and R. C. Rudoff

5) Gaithersburg(1991): “Application of Poisson Statistic to the Problem of Size and VolumeFlux Measurement by Phase Doppler Anemometry”by C.F. Edwards and K.D. Marx

6) Rouen(1994): “Study on Wave Motion and a Breakup of Annular Liquid Sheet in a Gas Stream”by H. Hashimoto, S. Kawano, H. Togari, A. Ihara, T. Suzuki and T. Harada

7) Seoul(1997): “Characterization of Liquid-Liquid Mixing in Sprays using Rainbow Refractometry”by S. V. Sankar, D. M. Robart and W. D. Bachalo

8) Pasadena(2000): “Investigation of Internal Flow in Transparent Diesel Injection Nozzles Using FluorescentParticle Image Velocimetry (FPIV)”by C. Tropea, J. K. Scaller, R. Wirth and J. Walher

9) Sorrento(2003): “Detailed Analysis of Spray Structure Air Entrainment in GDI Sprays Using a TomographicApproach”by C. Seibel, K. Gartung, S. Arndt and B. Weigand

10) Kyoto(2006): “The Influence of Surfactants on Impacting Drops”by A. Rozhkov, B.Prunet-Foch, M. Vignes-Adler

11) Vail(2009): “Ultra-fast Structured Laser Illumination Planar Imaging (SLIPI) for single-shot imaging of densesprays”by K,Kristensson, E.Berrocal, M.Richter, M.Alden

12) Heidelberg(2012)“Nozzle Geometry Effects on Primary Atomization”by Marco Arienti and Mark Sussman

Prof. Chigier received Tanasawa Awardat Sendai, Japan on 19８８