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Bouncing flame

Bouncing flame. Dudin Maxim Lyceum № 130. Problem. Place a flame (e.g. from a Bunsen burner) between two charged parallel metal plates. Investigate the motion of the flame. The investigation plan. To observe the phenomenon To study the causes of the phenomenon

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Bouncing flame

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  1. Bouncing flame Dudin Maxim Lyceum № 130

  2. Problem • Place a flame (e.g. from a Bunsen burner) between two charged parallel metal plates. Investigate the motion of the flame.

  3. The investigation plan • To observe the phenomenon • To study the causes of the phenomenon • To rate the deviation angle of the flame theoretically • To build the setup and rate deviation angle of the flame experimentally • To compare the theory with experiments

  4. Observation of the effect Beginning position + -

  5. Scheme of burning Afterburning zone Reaction zone Evaporation of paraffin C32H68+49O2→32CO2+34H2O

  6. Ionization • СН+О→СНО++е- • Maximum ionization is in the flame front, where chemical processes take place

  7. Charge distribution + - + - + - + - + - + -

  8. Theoretical explanationof deviation and bounces Part with positive charge + - Charged parts of the flame are under influence of Coulomb force Flame starts to deviate Part with negative charge

  9. Charge fly out, concentration varies at the given point Charge concentration is changing q varies, varies too - + The visible part of the flame start to bounce

  10. Force applying Y X

  11. Calculation of buoyancy and gravitation force Using Mendeleev-Clapeyron equation we can calculate the density of subsistence in the flame () Value of the flame is 1,3 cm2 , temperature is 1567 K

  12. Calculation of Coulomb force - Ionization degree (the ratio of ionized molecules to the whole number of molecules N) - Positive charge Using Mendeleev-Clapeyron equation we can calculate N:

  13. Calculation of ionization degree Saha’s formula was used to calculate the degree of heat ionization in gas: • mass of electron • Planck constant • Boltzmann constant • – temperature of flame (1567 K) • P – pressure of gas (atmospheric) • - energy of atoms ionization (CH2)

  14. Theoretical dependence

  15. Setup + Current source, 12V Voltage transformer, 12V-5kV -

  16. Experiment 5 cm between plates - + Deviation of the upper edge of the flame in the horizontal – 1.9 cm Deviation angle of the upper edge is about 72

  17. Dependence of angle of upper edge deviation on the distance between the plates Angle of upper edge deviation,̊ Electric field, N/m*10^6

  18. Results of the research • Phenomenon was observed • Theoretical explanation of the effect was suggested: • Chemical properties and ionization were investigated • Main reason of deviation – applying of the Coulomb force • Main reason of bounces – changing of charge at the given point • Theoretical dependence of deviation angle on electric field was made • All the forces were calculated • Experimental dependence of deviation angle on electric field was made • We've compared theoretical results with experimental results

  19. Thanks for attention

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