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Transient heat transfer behavior of water spray evaporative cooling on a stainless steel cylinder with structured surface for safety design application in high temperature scenario

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Abstract

High heat transfer performance of spray cooling on structured surface might be an additional measure to increase the safety of an installation against any threat caused by rapid increase in the temperature. The purpose of present experimental study is to explore heat transfer performance of structured surface under different spray conditions and surface temperatures. Two cylindrical stainless steel samples were used, one with pyramid pins structured surface and other with smooth surface. Surface heat flux of 3.60, 3.46, 3.93 and 4.91 MW/m2 are estimated for sample initial average temperature of 600, 700, 800 and 900 °C, respectively for an inlet pressure of 1.0 MPa. A maximum cooling rate of 507 °C/s was estimated for an inlet pressure of 0.7 MPa at 900 °C for structured surface while for smooth surface maximum cooling rate of 356 °C/s was attained at 1.0 MPa for 700 °C. Structured surface performed better to exchange heat during spray cooling at initial sample temperature of 900 °C with a relative increase in surface heat flux by factor of 1.9, 1.56, 1.66 and 1.74 relative to smooth surface, for inlet pressure of 0.4, 0.7, 1.0 and 1.3 MPa, respectively. For smooth surface, a decreasing trend in estimated heat flux is observed, when initial sample temperature was increased from 600 to 900 °C. Temperature-based function specification method was utilized to estimate surface heat flux and surface temperature. Limited published work is available about the application of structured surface spray cooling techniques for safety of stainless steel structures at very high temperature scenario such as nuclear safety vessel and liquid natural gas storage tanks.

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Abbreviations

A:

Surface area of the sample (m2)

d n :

Nozzle orifice diameter (mm)

g :

Acceleration due to gravity (m/s2)

h:

Height of fin

k :

Thermal conductivity

Nu :

Nusselt number

P n :

Nozzle pressure (MPa)

P:

Tip to tip distance between two adjacent fins

Q :

Heat flux (W/m2)

T :

Surface temperature

U(x,t):

Kernel function

u o :

Spray velocity at nozzle exit (m/s)

u j :

Mean spray impingement velocity (m/s)

W e :

Weber number

b :

Base width of the fin

z :

Nozzle to surface distance (mm)

ΔP :

Pressure drop between spray nozzle and spray chamber

Δx s1 :

Surface to T1 location distance (mm)

FSM:

Function specification method

FSS:

Fluid supply system

IHCP:

Inverse head conduction problem

LNG:

Liquid natural gas

MVD d30 :

Mean volume diameter (µm)

NPP:

Nuclear power plant

SMD:

d32 Sauter mean diameter (µm)

T1:

Thermocouple at location 1 inside the sample

T2:

Thermocouple at location 2 inside the sample

T3:

Thermocouple location inside the insulation

UFC:

Ultra fast cooling

1D:

One dimensional

θ :

Nozzle spray angle (°C)

Ρ :

Density (kg/m3)

ν :

Surface tension (N/m)

ϕ T :

Diameter of thermocouple hole

d:

Droplet

l :

Liquid

n :

Nozzle

t:

Time

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Acknowledgments

The authors are grateful for the support by the State Key Development Program for Basic Research of China (No. 2012CB720403), the National Natural Science Funds for Distinguished Young Scholar (No. 51325602), the Fundamental Research Funds for the State Key Laboratory of Mechanical Transmission, Chongqing University (No. SKLMT-ZZKT-2014 MS 17) and the the fund of the Key Laboratory of Special Power Supply (No. MSPS2012-02).

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Aamir, M., Liao, Q., Hong, W. et al. Transient heat transfer behavior of water spray evaporative cooling on a stainless steel cylinder with structured surface for safety design application in high temperature scenario. Heat Mass Transfer 53, 363–375 (2017). https://doi.org/10.1007/s00231-016-1830-5

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