Accession Number : ADD014832

Title :   Multiplel Channel Automatic Concentration Meter.

Descriptive Note : Patent, Filed 27 Jun 78, patented 15 Jan 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Howard, Robert G ; Zivi, Edwin L , Jr

Report Date : 15 Jan 1991

Pagination or Media Count : 9

Abstract : This system measures the concentration level of additives dissolved or suspended in a liquid by measuring the changes which the additives cause to the heat transfer characteristics of the liquid. A plurality of cylinders and pistons sample the liquid to be measured and pump the samples past a hot film anemometer probe at a constant flow rate. A rigid of wires upstream from the hot film anemometer probe is used to cause isotropic turbulence in the liquid flow around the measuring probe is proportional to the rate at which heat is transferred away from the probe by the liquid flowing past. The rate at which heat is transferred away from the probe is a function of the specific heat, thermal conductivity, viscosity, and turbulent flow characteristics of the liquid which in turn are a function of the concentration level of additives in the liquid. Calibration curves for a given additives, liquid temperature and liquid flow rate are used to determine concentration level from the measurement probe output signal.

Descriptors :   ADDITIVES, ANEMOMETERS, CALIBRATION, FILMS, FLOW RATE, FLUID FLOW, HEAT TRANSFER, ISOTROPISM, LIQUIDS, MEASUREMENT, OUTPUT, PISTONS, PROBES, RATES, RIGIDITY, SIGNALS, SPECIFIC HEAT, TEMPERATURE, THERMAL CONDUCTIVITY, TURBULENCE, TURBULENT FLOW, VISCOSITY, WIRE

Subject Categories : Test Facilities, Equipment and Methods
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE