flow-rate of fluid in the area between the conduit wall and the contour defined by the velocity measuring points which are the closest to the wall, vedeliku vookiirus toru seina ja seinale kõige lähemal asuvate vookiiruse mõõtepunktide poolt määratletud voo kontuuri vahelises piirkonnas, volume flow rate in the area located between the pipe wall and the contour defined by the velocity measuring points which are the closest to the wall