Hot-wire mass flow sensor with low-loss bypass passage

Details Hot-wire mass flow sensor with low-loss bypass passage Hot-wire mass flow sensor with low-loss bypass passage

2005-12-13

2005-12-13

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Proportional

Reexamination Certificate

active

06973825

ABSTRACT:
A mass fluid flow sensor includes an internal bypass passage characterized by a first section that converges along a first axis to define a nozzle, and a radially-expanded generally-cylindrical second section immediately adjacent to and coaxial with the first section so as to define a radial step at the nozzle exit. The passage further includes a semispherical third section adjacent to the second section having the same nominal diameter, a converging fourth section whose nominal axis is disposed at a right angle to the nominal axis of the first and second sections, and a fifth section adjacent to the fourth section that includes a further ninety degree bend. The resulting U-shaped passage features reduced pressure losses and an improved velocity profile, whereby the performance of a sensing element disposed in the passage proximate to the radial step is improved.

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