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A method for volumetric visualization of temperature distribution: three-dimensional meshed infrared thermography

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Abstract

In this study, a method called three-dimensional meshed infrared thermography (3D MIT) was developed to visualize the volumetric temperature of air using an infrared camera. The main operating principle of the proposed method is to image the spheres using an infrared camera and processing the images with computer software to obtain the volumetric temperature distribution. For the correct implementation of the method, an equation is proposed to determine the distance between the thermal target and the measurement target placed in the flow to be examined. The proposed method was compared with conventional measurement screen methods, namely those using a plane target and a high-porosity target, via particle image velocimetry (PIV) in terms of flow effects. The temperature measurement capability of the proposed method is presented in comparison with the results of thermocouple and conventional measurement screen-based measurements recorded using a jet flow. In addition, the volumetric temperature isosurfaces obtained via the 3D MIT method of a jet flow were compared with the volumetric velocity isosurfaces obtained via the PIV method in terms of the flow structure.

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Abbreviations

CD :

Drag coefficient CFF

FD :

Drag force (N)

Af :

Frontal area (m2)

ρ:

Density of the fluid (kg/m3)

V:

Fluid velocity (m/s)

LR :

Displayed length in the corresponding axis in the image plane (m)

LS :

Sensor size at related axis (m)

d:

Distance between lens and object plane (m)

f:

Focal length of camera lens (m)

Sf :

Scale factor

P#:

Pixel number of camera at related axis

P#sphere :

Number of pixels filled with the spheres at related axis

Dsphere :

Sphere diameter (m)

N:

Aperture number

c:

Circle of confusion (m)

s:

Focusing distance (m)

DN :

Near-focus distance (m)

DF :

Far-focus distance (m)

H:

Hyper-focal distance (m)

DOF:

Depth of field (m)

n:

Minimum number of pixels at the corresponding axis that should be covered by the measurement sphere in the image

ReD :

Reynolds number

D:

Sphere diameter (mm)

ʋ:

Air kinematic viscosity (m2/s)

\({\overline {{Nu}} _{\text{D}}}\) :

Nusselt number

Pr:

Prandtl number

µ:

Dynamic viscosity (Ns/m2)

\(\bar {h}\) :

Convection coefficient (W/m2K)

K:

Thermal conductivity (W/mK)

t :

Time (s)

ρ:

Density (kg/m3)

cp :

Specific heat capacity (J/kgK)

Ti :

Initial temperature (K)

T∞ :

Temperature of the air (K)

Bi:

Biot number

ks :

Thermal conductivity of the sphere (W/mK)

Ree :

Blade Reynolds number

uL :

Linear velocity of the outer tip of the fan blade (m/s)

D2 :

External diameter of the CFF (m)

N:

Number of rotation per minute

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Authors and Affiliations

  1. Mechanical Engineering Department, Dokuz Eylul University, Tınaztepe, Izmir, Turkey

    Özgün Özer, Dilek Kumlutaş & Utku Alp Yücekaya

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  1. Özgün Özer
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  2. Dilek Kumlutaş
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  3. Utku Alp Yücekaya
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Correspondence to Özgün Özer.

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Özer, Ö., Kumlutaş, D. & Yücekaya, U.A. A method for volumetric visualization of temperature distribution: three-dimensional meshed infrared thermography. Exp Fluids 60, 54 (2019). https://doi.org/10.1007/s00348-019-2704-7

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  • DOI: https://doi.org/10.1007/s00348-019-2704-7

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