Thermistor: Digikey PN 541-1169-1-ND, THERMISTOR PTC 330 OHM 1% 0603

Also, even though the Trinket appears to have 8 analog inputs, I'm going to leave a space for a MAX11629EEE+-ND, ADC 12BIT 300KSPS 8CH 16-QSOP on the sensor PCB, so it can be standalone if needed.

I'm thinking of using 8 thermistors for the array. I think the small 0603 package will give leave it with a small thermal mass to be sensitive to small flow changes.