@inproceedings{SchaefleKautz2019, author = {Sch{\"a}fle, Claudia and Kautz, Christian}, title = {Students reasoning in fluid dynamics: bernoulli's principle vs. the continuity equation}, series = {Proceedings of the 10th international conference on Physics Teaching in Engineering Education}, booktitle = {Proceedings of the 10th international conference on Physics Teaching in Engineering Education}, editor = {Lock, Arjan}, organization = {SEFI - Soci{\´e}t{\´e} Europ{\´e}enne pour la Formation des Ing{\´e}nieurs}, isbn = {978-90-9031874-5}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-13104}, pages = {1 -- 8}, year = {2019}, abstract = {In this work we investigate students' thinking about and difficulties with incompressible, steady pipe flow. There is substantial evidence that students have difficulty applying and prioritizing the two basic principles of mass conservation (i.e., the continuity equation) and energy conservation (i.e., Bernoulli's equation). When distracted by questions which involve gravity students based their answers on ill-supported assumptions about local pressures. The predominant arguments use a simplified Bernoulli equation, descriptive arguments or analogies to single-particle motion. Based on these results, an instructional intervention is developed that seems to address the observed difficulties.}, language = {en} }