Daniel bernoulli put forward the Bernoulli principle in 1726. This is the basic principle adopted by hydraulics before the establishment of the theoretical equation of fluid mechanics continuum, and its essence is the conservation of fluid mechanical energy. Namely: kinetic energy+gravitational potential energy+pressure potential energy = constant. Its most famous inference is that when the flow rate is constant, the pressure will be low when the flow rate is high.

About the author:

Daniel bernoulli's academic works are very rich, including more than 80 kinds of mathematics and mechanics works and papers.

1734, daniel bernoulli and his father John won the double prize of the Paris Academy of Sciences for their excellent work "The reason why planets revolve at different angles to the equator of the sun". Daniel's award-winning times can be compared with the famous mathematician Euler, so he is loved by European scholars.

During the 30 years from 1725 to 1757, he studied astronomy (1734), gravity (1728), tides (1740) and magnetism (/kloc-0) successively.

Daniel bernoulli was also a member of the Academy of Sciences or Science Societies in Bologna (Italy), Bern (Switzerland), Turin (Italy), Zurich (Switzerland) and Munich (Germany), and he still retained the title of Academician of the Academy of Sciences in Petersburg before his death.

Related: practical application of Bernoulli theorem

If the cross-sectional area of the flow tube changes slowly along the flow direction, Bernoulli theorem is often applied to the average velocity and average pressure of the flow tube in engineering application. Using this approximate treatment and the continuity equation of the flow tube, some useful results can often be obtained simply.

In real fluid, mechanical energy is not conserved along the streamline, and the power consumption generated by viscous friction is dispersed into heat energy. Therefore, when popularizing Bernoulli theorem in viscous fluids, energy loss caused by resistance must be considered.