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Li Chen raised his hand, than the index finger.
He mastered the way of lectures, understand lectures, when combined with body movements easier for everyone to deepen the impression.
"Remember, I have to say the theorems in fluid mechanics, we need to use: the continuum hypothesis, theorem of conservation of mass, energy conservation theorem, momentum theorem, stress tensor, viscosity hypothesis allowed to ask questions.."
Li Zhen finished, put down the triangular foot, looked up. People head down to write a note.
When they finished writing notes, instant, everyone raised his hand to brush brush.
"Hou Qiang question."
Hou Qiang quickly stood up, the tone of the fast: "? What are sticky if"
Li Chen naturally know, there are many of these theorems is not talked to them, but can not remember what Li Chen have said what is not talked about, therefore the opportunity for everyone to ask questions:
"Sticky hypothesis stress applied to the fluid and the resulting deformation of a certain relationship to the macroscopic properties of the fluid link, the performance of internal friction of the fluid, which is viscous hypothesis due to the viscosity of the energy action, in the absence of external energy supplement, the fluid movement will gradually stopped viscous fluid movement play an important role on the flow near the surface of the object layer by layer surface was reduced to zero and, under certain conditions may the fluid from the surface of the object. this hypothesis is sticky. "
Li Zhen was slow and could try to tone he said.
'Falling' a group of people took a deep breath, and even gas is not out, put pen to record crazy.
This is too long, had to engage in hurry, you hurry to engage in such a moment to forget.
Lin Xiufeng moment red eyes, full of red blood, the people's hearts in the roar, have collapsed.
He had not felt such a strong pressure, obviously attend a class, attend to the ground, the people must be crazy. Want roar, slowly, and then slowly. Slow, ah, did not catch ah.
Those other teachers also must be crazy, have to write off a hand. This fly write, is simply a kind of torture, and to the degree that you write his language can equal. Speak concept, you can also choose to focus in mind, but that theorem, it is a word Less ah.
'Falling' not to mention class deserted.
Li Chen of the class, you even scratched his head are reluctant to waste time.
"Continue to ask questions. Blue seek harsh."
Kyushu Institute of Physics of the first people to find the harsh blue hurriedly stood up: "What is the continuum hypothesis?"
"Molecules by the material, although the molecules are discretely distributed, do random thermal motion, but in fact a small range, to make the mean thermal motion of the molecules of the fluid is stable micelles can thus be assumed that fluid is constituted by a continuous material, wherein the temperature, density, pressure and other physical quantities are continuous scalar field distribution. "
"Continue to ask questions."
"What is the law of mass conservation?"
"After the chemical reaction, the reacted mass of each material is equal to the sum of the total reaction mass of each substance. This is called the law of conservation of mass. Also called the law of conservation of matter which is one of the basic laws of nature ubiquitous .Here I emphasize the way, we do not take it by the quality and the conservation of energy to engage in confusion. "
Li Chen put on the cup drink some water throat: "Simply speaking, conservation of mass, that is the" quality ", i.e., the total mass of the reactants is equal to the total mass of the product; said energy conservation is" energy ", i.e. the reactants the total energy absorbed or released plus the total energy is equal to the product of the total energy. one is quality, one is energy, do not get confused. "
"I ask questions, what is the law of conservation of energy?" Lin Xiufeng shouted.
Li Zhen looked at him, faint, said:. "And unrelated to the content of this lesson, after school to discuss with others."
Saying very tactful.
But Lin Xiufeng understand the meaning, that is, you do not keep up with the progress of downtown. Did not understand it after school to ask them, do not affect my time ......
Lin Xiufeng smile soon, he felt that he could not understand ......
This variety theorem is unheard of, never seen before.
In fact, Kyushu Institute of Physics who is able to understand, they need less of Li Chen explain. Li Zhen told them concepts they can understand about. Then again everyone together to discuss after-school, will be able to completely understand.
Li Chen said: "I mainly talk about stress tensor, should force the power of the concept of stress tensor for everyone some vague application ......."
"The force of the fluid micro-element, the main body force and surface force, the force and volume of surface forces they are ...... ...... bounded by the stress tensor of second order and a surface normal to the product described, only three second order stress tensor quantity is independent, so long as three different surfaces to know the stress of a point, the stress distribution can be determined at this point of ...... "
All have crazy, I did not think the stress tensor Detailed actually be so long. Record your breath of breath.
Breaking her hand.
The next half an hour, Li Chen began the illustration, for example explain the theorem.
Then he began to explain the fluid dynamics.
"Fluid Mechanics includes both basic theory of natural sciences, but also relates to the use of science in engineering technology as forces from the fluid point of view, can be divided into fluid statics, fluid kinematics and fluid dynamics; from different 'mechanical model "the study points, there is an ideal hydrodynamic, hydrodynamic viscous, incompressible fluid dynamics of compressible fluid dynamics ......"
"A lot of branches and fluid mechanics, focusing on the record about fluid mechanics covers: hydrodynamics, aerodynamics, penetration mechanics, mechanics, environmental fluid mechanics, biorheology ......"
"We probably talk about these concepts branches, said first biorheology ......"
"......"
Lectures almost an hour, Li Zhen looked at the time: "Well, today was talking about class more, we consolidate after-school look, be sure to put all of today's content penetration in tomorrow's need rote. down the place, we must rote. class! "
Then, Li Zhen holding triangle ruler left.
Since these transferred to the teacher seems unbearable Dayong, Li Zhen do not expect them. Today the class or classes,Lest they waste the time of day.
"Xie Li Shih!"
Everyone all stood up, bowed.
After Li Chen left the whole auditorium completely exploded.
Liu caught holding the hands of a notebook, stood on the table and shouted: "Who understand the special What the hell is that biorheology son this point I do not understand.."
"I have a key not get to know why the explosion is also included in the fluid dynamics? How can the blast is fluid it? Li Shih have talked about, I did not understand, who gave me special What about ah."
"Clear writing notebook replacement. Who told me before I never understood the course, I let him copy my handwriting, and give him a hundred coins!"
"Who told me to change ah Who told me about the conservation of mass, ah, I'm willing to give him to explain the stress tensor."
"......"
Group of teachers completely dumbfounded, completely listen to the bible!
They learn to understand what is the mode of the Academy of Sciences of Kyushu.
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