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

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Министерство образования и науки Российской Федерации
Федеральное государственное бюджетное образовательное учреждение
высшего образования
"НИЖЕГОРОДСКИЙ 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.

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Heat exchanger

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Pipes with a continuous thread of roughness
Profiles
Triangular
Rounded
Rectangular

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Twisted tape inserts

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Dependence of hydraulic resistance factor of rough tubes
with various thread roughness profile and with similar
heights of ledges on Re

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Dependence of hydraulic resistance factor of rough tubes
with triangular thread roughness profile on Re: line – for
smooth tube (by calculation)

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Dependence for pipes with threaded roughness with twisted tape
inserts
Heat transfer 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)

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Thank you for your
attention.

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Abstract
I chose this topic for research on the following reason. At 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.