Proposta de uma nova prática para o laboratório na disciplina de Física 2 - Hidrodinâmica: tubo de Venturi

Abstract

This monograph is based on an experiment conducted with the Venturi's tube that was applied in the laboratory instrumentation of Physics Department of Federal University of Ceará, it was identified that there is no practice in this area. How to result this work, also was created a roadmap for its implementation, aiming of deepen the theoretical content of hydrodynamics of undergraduate physics students. In laboratory practice with students that are graduating who reproduced the experiment with the Venturi's tube following the roadmap, that was filled out with the data obtained in the experiment and, at the end, an evaluation questionnaire was applied. To understand the behavior of the Venturi's tube has to remember that in an ideal fluid: the flow is laminar, the fluid is incompressible and the mass does not vary in the course of its path inside the tube. Firstly was measured outflow to calculate the velocity of outflow. For this a two-liter plastic bottle and a chronometer is used to measure time to fill it water, and then used the Bernoulli's equation. Knowing the areas of the cross sections of the tubes, was replaced his values and it was found out his speeds. With an experimental methodological approach is intended to lead students to reflect on the teaching of physics, making use of learning theory in order to explain specific facts observed and leading our students to learn the principles of learning from the experiment. It is noteworthy that the experiment the venturi's tube can be seen in everyday life of everybody , for example, if it reduces the passage of water with your finger on a garden hose causing an increasing speed of the water flowing. Thereby sharpening the student's creativity, it is possible to extract of this situation an opportunity that may demonstrate physical phenomena to causing a behavioral change on the educating, motivating them to study.