英語翻譯
3.1.1 Type of objects and their effect on the results
According to the signals received,the following kinds of
object have been observed:
(a) single bubbles,
(b) agglomerates constructed of single bubbles,
(c) big bubbles,
(d) plugs,
(e) foam.
An important feature of two-phase.ow is the interfacial
surface.The refraction of light occurs on it.Because of
this,the interfacial surface is recorded as a part of the
image with the greatest grey level value.The fact that
the objects(gas structures) are actually convex causes the
observedline ofthe interfacial surfacetobe thick(which is
why it is dark).Single bubbles are usually small in size.
Because of this,their edges are close to each other.This is
why these objects have a thick border,causing their darker
colour from the enclosed liquid.The form of the graphical
representationoftheobjectsisapeak,whichgoesupwards
in the direction of ascending grey level values.The super
.cial probe does not detect a single bubble—there are no
clear signals on the trace recorded by this probe,because
the value that represents this object gets lost among the
averaged background and values of the other objects.
The elongated probe gives a response in the form of
peaks with amplitudes varying between 0.7 and 1.5 in
greylevel scale.OnlyforSB1.owisit possibletogivethe
amplitude for single bubbles.In the case of other kinds of
.ow,there is a larger quantity of objects crossing the area
of the probe at any one moment.The spot probe gives the
clearest peaks,the amplitude of which varies between 4
and 14 in the grey level scale.It always gives correct
information about a single bubble.
Agglomerates are conglomerations of single bubbles,and
therefore they appear as larger objects but with a similar
grey level value to a single bubble.Also,the impulse is
similar—it is oriented towards higher grey level values.
Agglomerates,treated as a single object,are properly
represented on the traces of the super.cial and elongated
probes.Theresultofanalysisis an increasingimpulse.The
signal strength depends on the size of the agglomerate and
its interfacial surface.The interfacial surface depends on
the packing density of the single bubbles.The spot probe
provides a view of the agglomerate that depends on
which part of the agglomerate crosses the probe area.If
the interfacial surface crosses the area of the probe,the
impulse increases,and if the body of a big bubble crosses
the probe area,the impulse decreases.
4注：以上只是部分內容,我會用多個賬號貼出完整文章,由于編碼問題,部分字符殘缺,殘缺字符一般為fl,fi等