Влияние параметров теплообменных штырьковых структур на их эксплуатационные характеристики

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Влияние параметров теплообменных штырьковых структур на их эксплуатационные характеристики
ISSN 0236-3941. Вестник МГТУ им. Н.Э. Баумана. Сер. Машиностроение. 2017. № 2 119
EFFECT OF HEAT-EXCHANGE PIN-FIN STRUCTURE PARAMETERS
ON ITS PERFORMANCE CHARACTERISTICS
N.N. Zubkov
Yu.L. Bityutskaya
Bauman Moscow State Technical University, Moscow, Russian Federation
Abstract Keywords
Creating pin-fins on heat exchanger’s cold plates is a pro-
mising way of improving their efficiency. Pin-fin heat
exchangers are widely used in liquid cooling systems for
electronic, high-current equipment, etc. Deformational
cutting technology (DC) is a proven method for productive
fabrication of high-density pin-fin structures. The pin-fins
are produced by additional machining of the previously
finned surface with а DC tool. Pin-fin structure’s surface
area, obtained by DC, can exceed 7-10 times its original
surface area. DC provides a variety of different pin-fin
shapes and structure's geometrical parameters. Finding an
optimal relative position and pin-fin parameters is an acute
problem. The article gives the technique and the results of
comparative experiments on convective heat exchange
of pin-fin structures. We conducted the experiments on a
test bench that simulated liquid cooling system operation
taking into consideration the effect of structure’s density,
pin-fin shape and verticality and the coolant flow direction
on cooled element temperature and structure’s pressure
drop. In our work we tested pin-fin structures, obtained by
DC, with spiral, needle-shaped and hook-shaped pins,
height of 1,9–5,1 mm and pitch of 0,6–2 mm. Findings of
the research show that the structure with 71 more vertical
needle-shaped pin-fin per square centimeter presents better
performance characteristics. No significant effect of coolant
flow direction on cooled element temperature and struc-
ture’s pressure drop was detected
Pin-fin structures, cold plate, convec-
tive heat exchange, deforming cutting,
liquid cooling
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