An instrument for measuring heat flux from an isothermal surface

Park, Hyun Jin; Lee, Dong Hoon; Ahn, Soo Whan

doi:10.1016/j.expthermflusci.2011.10.001

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Nonetheless, differential thermometry can be used to relate the heat flux to the temperature gradient and the material properties (known heat resistance). Heat flux sensors based on this technique have been designed for a variety of applications ranging from industry to biological systems research, as well as radiometry for photo-voltaic and solar thermal energy studies [16,17,18,19]. Heat flux uncertainty of ±4 % and ±7 % are reported by [18] and [19] respectively.…”

Section: Introductionmentioning

confidence: 99%

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Optimized thermoelectric sensitivity measurement for differential thermometry with thermopiles

Prangemeier

Nejati

Müller

et al. 2015

Experimental Thermal and Fluid Science

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A novel approach to calibrate the sensitivity of a differential thermometer, consisting of several thermocouples connected in series (thermopile), has been developed. The goal of this method is to increase the accuracy of small temperature difference measurements (∆T ≤ 1 K), without invoking higher sensor complexity. To this end, a method to determine the optimal temperature difference employed during the differential measurement of thermoelectric sensitivities has been developed. This calibration temperature difference is found at the minimum of combined measurement and linearization error for a given mean temperature. The developed procedure is demonstrated in an illustrative example calibration of a nine-junction thermopile. For mean temperatures between −10 • C and 15 • C, the thermoelectric sensitivity was measured with an uncertainty of less than ±2 %. Subsequently, temperature differences as low as 0.01 K can be resolved, while the thermometer used for the example calibration was accurate only to ±0.3 K. This and higher degrees of accuracy are required in certain research applications, for example to detect heat flux modulations in bifurcating fluidic systems.

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Section: Introductionmentioning

confidence: 99%

“…Heat flux sensors based on this technique have been designed for a variety of applications ranging from industry to biological systems research, as well as radiometry for photo-voltaic and solar thermal energy studies [16,17,18,19]. Heat flux uncertainty of ±4 % and ±7 % are reported by [18] and [19] respectively.…”

Section: Introductionmentioning

confidence: 99%

Optimized thermoelectric sensitivity measurement for differential thermometry with thermopiles

Prangemeier

Nejati

Müller

et al. 2015

Experimental Thermal and Fluid Science

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“…Many researchers have investigated the heat transfer and fluid flow characteristics of single phase impinging jets in the past decades [1][2][3]. Recently, several researchers have examined heat transfer and fluid flow characteristics of single phase impinging jets at low nozzle-to-plate spacings and high nozzle-toplate spacings [4][5].…”

mentioning

confidence: 99%

Heat Transfer Characteristics of Submerged Two Phase Impinging Jets

Kuraan¹,

Centofanti²,

Ulus³

et al. 2017

Proceedings of the 4th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'17)

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Extended AbstractImpinging jets are widely applied in many engineering applications for the cooling, heating, and drying of surfaces due to higher rates of cooling, heating, and drying. Many researchers have investigated the heat transfer and fluid flow characteristics of single phase impinging jets in the past decades [1][2][3]. Recently, several researchers have examined heat transfer and fluid flow characteristics of single phase impinging jets at low nozzle-to-plate spacings and high nozzle-toplate spacings [4][5]. However, the understanding of heat transfer and fluid flow characteristics for submerged two-phase impinging jets in the wide range of nozzle-to-plate spacings is still limited.The purpose of this study is to determine the effect of nozzle-to-plate spacing on heat transfer and fluid flow characteristics of submerged two-phase impinging jets on a flat surface using water and air as the working fluids. The effects of the nozzle-to-plate spacings (H/d = 0.08 -30) on the Nusselt number and pressure are considered under a fixed water flow rate condition. Stagnation pressure of the submerged two-phase impinging jets was measured to understand a relationship with heat transfer characteristics. The nozzle-to-plate spacing was controlled with an x-y-z stage with a 10 µm resolution, (Thorlabs, Inc, PT3A/M). Compressed air was supplied from a mass flow controller (Omega FMA5520A) having an accuracy level of ±1% and a repeatability of ±0.15%. A grear pump (Micropump) was used to control water flow rate. A stainless steel foil was used as a heated surface, which was connected with a high voltage DC power supply (Agilent 6651A #J03) in series with a shunt, rated 0-6 V and 0-60 A. Four K-type thermocouples of diameter 0.08 mm were used to measure temperature using OMEGA (OM-CP-QuadTemp2000) digital data acquisition system.The results show that the Nusselt number and stagnation pressure are divided into three regions; Region I) jet deflection region (H/d ≤ 0.5), Region II) inertia dominant region (0.5 < H/d ≤ 7), and Region III) buoyancy region (7 < H/d ≤ 30). In region I, the Nusselt number drastically increases with decreasing the nozzle-to-plate spacing due to the increase of the stagnation pressure with bubble collisions and bursts. In region II, the effect of the nozzle-to-plate spacing is negligible on the Nusselt number due to the inertia dominant effect in the potential core region with bubble collisions. In region III, the Nusselt number monotonically decrease with increasing the nozzle-to-plate spacing due to the decrease of bubble collisions on the surface by buoyancy force.

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A design of a semi-virtual calibration experiment for a sensitivity enhancement of general-purpose heat flow meters applied in residential buildings

Kočí

Černý²

2022

Energy

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An instrument for measuring heat flux from an isothermal surface

Cited by 6 publications

References 20 publications

Optimized thermoelectric sensitivity measurement for differential thermometry with thermopiles

Optimized thermoelectric sensitivity measurement for differential thermometry with thermopiles

Heat Transfer Characteristics of Submerged Two Phase Impinging Jets

A design of a semi-virtual calibration experiment for a sensitivity enhancement of general-purpose heat flow meters applied in residential buildings

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