Without visualization it is generally impossible to observe the flow behavior. We present in this paper, two parts of a study for evaluating four various visualization techniques. This pilot study was conducted to test the prototype and to help design a full scale experiment. Our results showed that streamlines, stream ribons, and stream tubes techniques gave a similiar result for user perception evaluation task as they are good for showing flow direction and temperature. On the other hand, surfaces techniques served more as cross section and also could predict temperature behavior, area or section. © 2010 IEEE.