Method for measuring convective inertia force

A method for determining mass flow rate of media moving through a conduit with two extremities restrained from experiencing lateral displacement, comprising in combination:

• a) generating a primary flexural vibration of the conduit in one of a symmetric and antisymmetric mode with respect to a midsection of the conduit by exerting a force laterally thereon, said primary flexural vibration of the conduit creating a secondary flexural vibration of the conduit out of phase relative to the primary flexural vibration of the conduit as a result of dynamic interaction between the primary flexural vibration of the conduit and motion of media moving through the conduit;
• b) detecting resultant flexural vibration of the conduit at the midsection thereof by using a first motion sensor providing a first alternating electrical signal generated by the resultant flexural vibration of the conduit at the midsection thereof, and resultant flexural vibration of the conduit at another section thereof intermediate the midsection and one of the two extremities of the conduit by using a second motion sensor providing a second alternating electrical signal generating by the resultant flexural vibration of the conduit at said another section thereof;
• c) taking a first numerical value of said second alternating electrical signal at an instant when numerical value of said first alternating electrical signal is equal to zero;
• d) taking a second numerical value of said second alternating electrical signal at an instant when numerical value said first alternating electrical signal reaches a peak value;
• and
• e) determining mass flow rate of media moving through the conduit as a function of ratio between said first and second numerical values of the second alternating electrical signal.