Hey Michael
Make a particle emitter with a red circle colored by a red radial gradient.
Its a matter of adding a gravity and edge collision behavior to the emitter and then an object below the particle stream. Make sure to take the bounce strength of the edge collision down so the particles do not bounce all over the place, hence making them flow forward like a stream.
do not forget to turn on motion blur in the render drop down. this will make the particles look just like flowing blood.
you can see what it looks like here:
https://reels.creativecow.net/film/blood-coming-out-of-a-needle
Give me your Email address and i can send you a sample file.
Eyal.
Eyal Shtark
Exhibitions and Multi-Media
Team Leader
Advertising department
ISCAR LTD.
Tel. +972-4-9970371
Fax. +972-4-9970422
Email: eyal@iscar.co.il