Vibratory flow meter with multichannel flow tube

A method of measuring a fluid with a vibratory meter comprising a multichannel flow tube, the method comprising:

• receiving an inverse Stokes number δ and a kinematic viscosity ν for the fluid;
• receiving an effective diameter deff of at least one of the two or more fluid channels of the multichannel flow tube, the two or more channels formed by a tube perimeter wall and one or more channel divisions extending along at least a portion of the tube perimeter wall;
• determining a drive frequency ω, wherein
• ω
• ≤
• 72
• ⁢
• v
• δ
• 2
• ⁢
• d
• eff
• 2
• ;
• applying a drive signal at the drive frequency ω to a driver coupled to the multichannel flow tube;
• and
• measuring a deflection of the multichannel flow tube with a pickoff attached to the multichannel flow tube.

A vibratory meter (5) including a multichannel flow tube (300, 400, 500), the vibratory meter comprising:

• a meter assembly (10) communicatively coupled to a meter electronics (20), the meter assembly comprising:
• the multichannel flow tube comprising two or more fluid channels (302, 402, 502) formed by a tube perimeter wall (304, 404, 504) and one or more channel divisions (306, 406, 506) extending along at least a portion of the tube perimeter wall,
• a pickoff (170l, 170r) attached to the multichannel flow tube,
• a driver (180) coupled to the multichannel flow tube, the driver being configured to vibrate the multichannel flow tube;
• and
• a meter electronics (20) coupled to the driver (180), with the meter electronics being configured to:
• receive an inverse Stokes number δ (1112) and a kinematic viscosity ν (1110) for the fluid;
• receive an effective diameter deff (1114) for at least one of the two or more fluid channels of the multichannel flow tube;
• determine a drive frequency ω (1108), wherein
• ω
• ≤
• 72
• ⁢
• v
• δ
• 2
• ⁢
• d
• eff
• 2
• ;
• apply a drive signal at the drive frequency ω to the driver coupled to the multichannel flow tube;
• and
• measure a deflection of the multichannel flow tube with the pickoff attached to the multichannel flow tube.