A 360Ã? twisted helical capacitance sensor was developed for holdup measurement in\nhorizontal two-phase stratified flow. Instead of suppressing nonlinear response, the sensor was\noptimized in such a way that a ââ?¬Ë?sine-likeââ?¬â?¢ function was displayed on top of the linear function. This\nconcept of design had been implemented and verified in both software and hardware. A good\nagreement was achieved between the finite element model of proposed design and the approximation\nmodel (pure sinusoidal function), with a maximum difference of +1.2%. In addition, the design\nparameters of the sensor were analysed and investigated. It was found that the error in symmetry\nof the sinusoidal function could be minimized by adjusting the pitch of helix. The experiments of\nair-water and oil-water stratified flows were carried out and validated the sinusoidal relationship\nwith a maximum difference of +1.2% and +1.3% for the range of water holdup from 0.15 to 0.85.\nThe proposed design concept therefore may pose a promising alternative for the optimization of\ncapacitance sensor design.
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