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Impingement cooling system for a large surface: multi-jet pulse spray

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Thermophysics and Aeromechanics Aims and scope

Abstract

The paper presents the experimental study on the influence of parameters of a multi-jet impingement spray on the cooling efficiency for a large flat surface. The study is based on common principes for engineering systems with high-rate heat and mass transfer using the impinging jets; this enables the draining of hogh heat loads with a low flow rate of the coolant. These results, along with using the Nusselt and Reynolds criteria, give the approach for estimating the aggregated efficiency of heat transfer coefficient while cooling with a multi-jet impingement spray.

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Abbreviations

U :

water droplet velocity, m/s

V a :

air coflow velocity, m/s

L :

length of the heat exchanger side, m

H :

distance between the source and heat exchanger, m

Δ τ :

pulse length, ms

F :

valve operation frequency, Hz

S :

flow cross section, m2

T w :

temperature of heat exchanger surface, °C

T :

coolant temperature, °C

q :

specific heat flux, W/m2

M :

liquid mass flow rate, kg/s

m s :

normalized (equal to one) specific liquid flow rate through the flow cross section S, kg/(m2s)

Re:

Reynolds number

Nu:

Nusselt number

α :

integral heat transfer coefficient, W/(m2·K)

ν :

air kinematic viscosity, m2/s

λ :

water thermal conductivity, W/(m·K).

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

    A. F. Serov, A. D. Nazarov, V. N. Mamonov, N. B. Mis’kiv & P. N. Karpov

Authors
  1. A. F. Serov
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  2. A. D. Nazarov
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  3. V. N. Mamonov
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  4. N. B. Mis’kiv
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  5. P. N. Karpov
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Corresponding author

Correspondence to N. B. Mis’kiv.

Additional information

This work was carried out in the framework of the state assignment for ITP SB RAS No. 121031800217-8.

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Serov, A.F., Nazarov, A.D., Mamonov, V.N. et al. Impingement cooling system for a large surface: multi-jet pulse spray. Thermophys. Aeromech. 28, 689–695 (2021). https://doi.org/10.1134/S0869864321050097

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  • DOI: https://doi.org/10.1134/S0869864321050097

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