The best distance of two thermistors is achieved.Using the finite element method and ANSYS-FLOTRAN CFD program.Effect of distance between two thermistors in different incline states on fluid field’s distributing of the sensing element is computed.The results are as follow:the distance of two thermistors changes

both temperature-field and fluid-field will change too.The velocity difference Δv of gas flow at both thermistors and tilt-angle relation curve will change with d

d=400μm

linearity range is narrowest

and slope is narrowest;d=300μm

linearity is best

and slope is larger;d=200μm

linearity range is narrower

and slope is largest.d=400μm

sensor’s linearity range is narrowest

sensitivity is lowest;d=300μm

sensor’s linearity is best

sensitivity is higher;d=200μm

linearity range is narrower

and sensitivity is highest.Thus

compared generally

the best project is the state of d=300μm.