516-0940/01 – Physical Charakteristics of Liquid Jets (FCHKP)

Gurantor departmentInstitute of PhysicsCredits0
Subject guarantorprof. Ing. Libor Hlaváč, Ph.D.Subject version guarantorprof. Ing. Libor Hlaváč, Ph.D.
Study levelpostgraduateRequirementOptional
YearSemesterwinter + summer
Study languageCzech
Year of introduction2003/2004Year of cancellation2011/2012
Intended for the facultiesFS, HGFIntended for study typesDoctoral
Instruction secured by
LoginNameTuitorTeacher giving lectures
HLA57 prof. Ing. Libor Hlaváč, Ph.D.
LUN10 prof. Dr. RNDr. Jiří Luňáček
Extent of instruction for forms of study
Form of studyWay of compl.Extent
Full-time Credit and Examination 45+0

Subject aims expressed by acquired skills and competences

To interpret and generalize theoretical and practical knowledge of liquid decomposition and spraying. To analyse the conditions of origin of high-velocity liquid jet, especially the outflow of liquid from the nozzle and separation or spraying of liquid jet accordint to many factors and conditions.

Teaching methods

Individual consultations


The subject includes theoretical and practical knowledge of disintegration and spaying of liquids. The physical ground and physical quantities influencing fineness of spraying are regarded. The student is got acquainted with the process of spraying and methods of research of liquid stream disintegration. The process in the course of the fuel combustion and knowledge exploitation during burning follows. Another substantial part represents the study of the high-energy liquid jet.

Compulsory literature:

KNAPP, R. T.; DAILY, J. W.; HAMMIT, F. G. Cavitation. New York: McGraw-Hill Book Company, 1970. IRA Cohen: Fluid Mechanics, 2004 R.Peter King: Introduction to Practical Fluid Flow, 2002

Recommended literature:

Y.Nakayama: Introduction to Fluid Mechanics, 1999 Papers in Proceedings of the Conference series of the BHR Group (Jetting Technology/Water Jetting since 1972 each two years). Papers in Proceedings of the Conference series of the WJTA (American Waterjet Conferences since 1981 each two years).

Way of continuous check of knowledge in the course of semester


Other requirements

Systematic preparation for lectures.


Subject has no prerequisities.


Subject has no co-requisities.

Subject syllabus:

1. FATE liquid RAY The causes of decay and shapes the beam liquid. Theory nevířivého and eddy dispensers. Areas and criteria for disintegration of liquid jet. Maximum diameter drops of liquid and its calculation. 2. Spraying liquids Physical properties of liquids. Physical principle of spraying. Rating Quality dispersed liquid. Distribution characteristics of the spray. 3. TYPES spraying liquids Pressure injection, rotary, ultrasonic and electrostatic spraying. The characteristic size of droplets in terms of types of dispensers. 4. METHODS OF STUDY spray LIQUID FUELS Measurement of injection and power factor, speed, kinetic energy range and beam. Measurement of spray angle and spatial distribution of drops. Geometric characteristics of the nozzle. 5. METHODS OF MEASURING THE SIZE OF DROP FUEL The method of capturing and solidifying drops, shock and optical methods, short-term speed photography and cinematography drops, electrical methods, weight and thermal. 6. USE spray Combustion of liquid fuels, preparing a mixture of internal combustion engines, spray paints, coatings, agricultural crops, aerosol mist in medicine. Hygiene and safety work during spraying of liquid fuels. 7. Sputtering, BURNING AND BURNING OF LIQUID FUELS Atomisation of petrol and diesel engines. Fuel injection nozzles. Ignition and combustion of liquid fuels rozprášeného. Resize drops to combustion theory, combustion of fuel drops. Flame structure and processes in the combustion chamber. Requirements for the burners. Mathematical modeling of burner areas. 8. HIGH SPEED LIQUID BEAM Generation and classification of high-speed liquid jet. Discharge liquid medium from the nozzle. Spreading liquid jet environment. Effect liquid jet of material. Violations of liquid jet materials. 9. Outflow of liquid from the TIP The theoretical description of the discharge liquid. The effectiveness of the beam on the liquid material. Velocity profile at outflow jet of liquid (water) from the nozzle. 10.VYSOKORYCHLOSTNÍ BEAM with abrasives Interaction liquid jet with abrasive particles in the mixing chamber and the rectifier tube. The break-up of abrasive material, particle acceleration the rectifier tube. The parameters of abrasive jet (particle size, flow of liquids and abrasive materials, abrasive jet speed). 11.PORUŠENÍ MATERIAL BEAM high-speed liquid Effect of nozzle diameter, fluid pressure, nozzle distance from the surface material, flow rate instrument, the angle of the beam at depth material. 12.KVALITA SURFACE MATERIALS The structure of surfaces generated by high-speed cutting technology liquid jet. Optical methods for measurement of surface structures.

Conditions for subject completion

Full-time form (validity from: 1960/1961 Summer semester, validity until: 2012/2013 Summer semester)
Task nameType of taskMax. number of points
(act. for subtasks)
Min. number of points
Exercises evaluation and Examination Credit and Examination 100 (145) 51
        Examination Examination 100  0
        Exercises evaluation Credit 45  0
Mandatory attendence parzicipation:

Show history

Occurrence in study plans

Academic yearProgrammeField of studySpec.ZaměřeníFormStudy language Tut. centreYearWSType of duty
2009/2010 (P1701) Physics (1702V001) Applied Physics P Czech Ostrava Optional study plan
2009/2010 (P1701) Physics (1702V001) Applied Physics K Czech Ostrava Optional study plan
2009/2010 (P2102) Mineral Raw Materials (3902V010) Automation of Technological Processes P Czech Ostrava Optional study plan
2009/2010 (P2102) Mineral Raw Materials (3902V010) Automation of Technological Processes K Czech Ostrava Optional study plan
2008/2009 (P1701) Physics K Czech Ostrava Optional study plan
2008/2009 (P1701) Physics P Czech Ostrava Optional study plan
2008/2009 (P2102) Mineral Raw Materials (3902V010) Automation of Technological Processes P Czech Ostrava Optional study plan
2008/2009 (P2102) Mineral Raw Materials (3902V010) Automation of Technological Processes K Czech Ostrava Optional study plan

Occurrence in special blocks

Block nameAcademic yearForm of studyStudy language YearWSType of blockBlock owner