SIMPLIFY VAPOUR-GAS CHANNEL MODEL.

                                                                    Dr.Spivak A.V.( spy39@mailcity.com)

                                         1. Calculation of diameter of the bottom channel.

Consider a formed condition of the vapour-gas channel. In this consideration an neglect:

a) reflection light from walls of channel and

b) absorption light by vapours a water in the channel.

  In such suggestions an area of evaporation (on Pic .1 shaded),

situated, on bottom of the channel, coincides on the transverse section with the diameter of bunch of radiating of at the depth channel h. Take that the bottom channel has form of half-spheres with diameter

Intensity of radiating on vaporize surface is given (in contempt an braiding by vapours) by dependency ,

where- a power of lazer bunch.

Condition of the stationarity allows to level pressures to the wall of channel on the part of water and pair in two different sections (Pic .1) - on the border bottom-channel - (I) and in the bottom spot of channel - (II).
In the section (II) will production equation:

                                                                        (1)

   where - --pressure saturated pair on the bottom, define of the overheat of surface,

      - pressure of vapours of return,

   -power come on the bottom lazer radiating,

   - share of energy, walking on evaporation, -

spare of the bottom, -the specific heat of the evaporation ,
-density

íîãî pair; - hydrosteady-state pressure in this section,

    - pressure on the part of liquids to account shallow
 
 

stretching, - a factor shallow stretching. In section (I)

similar equation has of the form of:

                                                                                      (2)

                                     where pressure of gas in section (I), which under real

meets the condition:

 < h possible take equal

                 From two these correlations easy to get:

                                                                                              (3)

                                 This equality means that within the framework of accepted admissions a pressure of vapours of return indemnifies additional curvature of surface of channel with small correction for hydrosteady-state part qgd / 2 Correlations (3) allows to define diameter of the bottom -

        through power account for the bottom radiation and share

                Disregarding hydrosteady-state adjustment an will production :

                                                                                           (4)

                                          For experimental parameters:

  = 85 Vt ,
  = 1(at temperature of liquid 100° C, when  the whole energy goes on evaporation)

will production of the value = 0.3cm.

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