Heat transfer and hydraulic resistance in rough tubes including with twisted tape inserts презентация

ГОСУДАРСТВЕННЫЙ ТЕХНИЧЕСКИЙ УНИВЕРСИТЕТ ИМ Р.Е. АЛЕКСЕЕВА"
 
Институт ядерной энергетики и технической физики
Кафедра "Иностранные языки"
 
Презентация по теме
"Heat Transfer and Hydraulic Resistance in Rough Tubes
Including with Twisted Tape Inserts"
 

студента: Ярахтина М.С.
группы: М16-ЯЭ
руководитель: к.ф.и., доцент
Лазаревич С.В.

roughness profile and with similar heights of ledges on Re

roughness profile on Re: line – for smooth tube (by calculation)

in a tube with uniform continuous roughness (Δ=0.11 mm, t=0.3 mm)

Heat transfer in a tube with uniform continuous roughness (Δ=0.12 mm, t=0.5 mm)

the present stage of development of the energy efficiency it’s hardly possible to find the ways to improve thermal scheme and increase the initial parameters of a steam. One of the possible ways out of this situation is to increase the efficiency of heat exchange equipment. Intensification of heat exchange is one of the ways increase efficiency to the of a heat-exchange equipment and thermal plant upon the whole. The efficiency intensification of heat exchange is estimated by the following characteristics: hydraulic resistance and the Nusselt number (efficiency heat transfer).
In this paper, processes such as hydraulic resistance and heat transfer were investigated.Tests were carried out on pipes with a continuous thread of roughness, with a different form of ledges. And also with twisted tape inserts that were inserted into the pipes. Various combinations of these intensifiers were used. Dependences of the hydraulic resistance and heat transfer on the Reynolds number were obtained. These dependencies are obtained for different geometric parameters. Generalizations of these data allow us to determine the optimal geometric parameters. Optimal geometric parameters are those, which have more advantages in heat transfer with a small increase of the hydraulic resistance.
Thus intensity of a heat transfer and pressure drop in tubes with various aspects of roughnesses is rather individually and also is defined by not only a relative height of elements of roughnesses, but their shape and disposing density on a surface.