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Experimental investigation of heat transfer on trapezoidal channel with three passes

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Abstract

In this study, we investigated the change of the heat transfer coefficient on the surface with the TLC method on a blade model with three-pass channel. It is seen that the Reynolds number effects, speed distribution in the channel and heat transfer coefficient distribution differ as a result of the geometry of the parts’ transition. In the experimental studies, comparison of circular- and square-holed transition parts of 20 m3 h−1 and 30 m3 h−1 flow experiments shows that although the channel with three passes has been found to have a more homogenous heat relay, the square hole used for the part of the transition with three-pass channels has access to the higher heat occurring compared to the circular-holed transition piece. In the 40 m3 h−1 and 50 m3 h−1 value experiments, the circular-holed transition piece used had the higher heat transfer coefficient in the channel and a more homogeneous distribution of the heat transfer was observed.

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Abbreviations

h :

Local heat transfer coefficient (W m−2 K−1)

k :

Thermal conductivity (W m−1 K−1)

α :

Thermal diffusivity of acrylic material (Plexiglas) (m2 s−1)

D h :

Jet hydraulic diameter (mm)

D jet :

Jet diameter (m)

D hi :

Inlet hydraulic diameter (m)

D ho :

Outlet hydraulic diameter (m)

Nu :

Nusselt number, hDh/k

V jet :

The value of velocity in jet (m s−1)

TLC:

Thermal liquid crystal

T i :

Temperature of the solid (°C)

T r :

Temperature of the convective flow (°C)

T w :

Temperature at which the liquid crystal color changes from red to green (°C)

t :

Time of the liquid crystal color change (s)

Q :

Flow rate (m3 s−1)

Q jet :

The value of jet flow rate (m3 s−1)

Re :

Reynolds number, V. Dh/ν

μ :

Fluid dynamic viscosity (m2 s−1)

ν :

Kinematic viscosity (m2 s−1)

Y :

Channel width (mm)

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  1. Mechanical Engineering Department, Engineering Faculty, Sakarya University, Serdivan, Sakarya, Turkey

    Unal Uysal & Imdat Taymaz

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  1. Unal Uysal
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Uysal, U., Taymaz, I. Experimental investigation of heat transfer on trapezoidal channel with three passes. J Therm Anal Calorim 140, 953–964 (2020). https://doi.org/10.1007/s10973-019-08237-1

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