Multi-walled carbon nano-tubes for performance enhancement of thin film heat flux sensors

Jadhav, Akash; Peetala, Ravi K.; Kulkarni, Vinayak

doi:10.1007/s00231-019-02765-0

Cited by 8 publications

(6 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thin layer is deposited on the substrate using a specialized brush (Camlin, India) with fine hairs. The sensitivity of the sensor is affected by the films' length-to-width ratio [42].…”

Section: Developing Pure Platinum Tfgmentioning

confidence: 99%

“…The performance of the TFGs was then compared to pure Ag TFGs to evaluate their effectiveness [41]. It is recommended to use MWCNTs for measuring low heat flux and for substrates made of Macor because they require higher sensitivity to enhance the output response [42].…”

Section: Sensitivity Measurementmentioning

confidence: 99%

“…This inverse relationship can be expressed as √𝜌 𝑠 ∁ 𝑠 𝑘 𝑠 in 𝜌 𝑠 , ∁ 𝑠 𝑎𝑛𝑑 𝑘 𝑠 refers to the density, specific heat, and thermal conductivity of the substrate material, respectively. This statement can be reinforced by referring to Equation 3, which describes the temperature change caused by a specific heat transfer in a semiinfinite solid [42].…”

Section: Experimental Analysis Using Thin-film Gaugesmentioning

confidence: 99%

See 2 more Smart Citations

Transient heat flux assessment using a platinum thin film sensor for short-duration applications

Dongare,

Peetala,

Gohil

et al. 2024

Heat Mass Transfer

Self Cite

View full text Add to dashboard Cite

The rapid fluctuations in heat transfer rates make it challenging to determine the surface temperature history and the estimation of accurate heat generation in research applications such as IC engines, gas turbines, and highspeed space vehicles. Therefore, thin-film gauges (TFGs) are generally used to measure the heat flux in such applications due to their high sensitivity and quick response time. The present study demonstrates that increasing the annealing heat treatment temperature, will enhance the adhesion of the thin film and the capabilities of these hand-made thin-film gauges for transient measurements at low temperatures and for short periods. In the present work, TFG is fabricated in-house using platinum as a sensing element and Macor as an insulating substrate. The sensitivity (S) and temperature coefficient of resistance (TCR) are estimated using an oil batch calibration technique. At the same time, the performance of TFG is tested in a dynamic convective environment. The TFG is exposed to the convective environment using a designed calibration set-up, and their transient heat fluxes are computed by conducting several trials. Additionally, the numerical solution has been accomplished using various experimental parameters. In comparison to the outcomes of the experimental method, it is observed that the average fluctuating temperature and mean surface heat flux have an inaccuracy of 0.33% and 4.17% respectively.

show abstract

“…The thin layer is deposited on the substrate using a specialized brush (Camlin, India) with fine hairs. The sensitivity of the sensor is affected by the films' length-to-width ratio [42].…”

Section: Developing Pure Platinum Tfgmentioning

confidence: 99%

Section: Sensitivity Measurementmentioning

confidence: 99%

Section: Experimental Analysis Using Thin-film Gaugesmentioning

confidence: 99%

See 1 more Smart Citation

Transient heat flux assessment using a platinum thin film sensor for short-duration applications

Dongare,

Peetala,

Gohil

et al. 2024

Heat Mass Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…The design performance of a prototype sensor was validated using both conduction and convection heat transfer calibration at low temperature. In a study by Zhang [7], 18 pairs of Pt-PtRh13 thermopiles were deposited on an alumina substrate and silicon oxide was used as the thermal resistance layer, which can measure temperature up to 1000 • C. The lead out was through a conductive silver adhesive bonding lead, the sensor sensitivity was 4.37267 × 10 −5 mV/(W/m 2 ), and the response time was 10 s. Jadhav [8] designed a heat flux sensor using Macor and quartz rods-with a 6 mm diameter and a 10 mm depth-as the substrate material, and platinum and MWCNTs as the sensing materials. Thin silver film is considered to establish electrical connections between the thin sensing film and the connecting wires.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of a Thermopile-Based Thin Film Heat Flux Sensor, Using a Lead—Substrate Integration Method

et al. 2022

View full text Add to dashboard Cite

An accurate and continuous measurement of heat flux is needed in many long-term operation facilities in order to monitor and improve the life of its machinery. A thin film heat flux sensor is usually fabricated via sputtering, according to different spatial arrangements of thermocouple junctions. A novel thin film heat flux sensor was designed, fabricated, and calibrated, but the connection between the thin film and the leads could not be fixed quickly and steadily. For this purpose, in this paper a method to seamlessly integrate the leads and the thin film has been proposed to improve the sensor output signal. The sensor is capable of simultaneously measuring surface heat flux and temperature magnitude, to address the current situation of the single design of heat flux sensors. The novel thin film heat flux sensor is structured as follows: Thirty pairs of NiCr-NiSi thermocouple junctions are deposited in an annular pattern on a well-designed ceramic substrate. Over the annular thermopile, a 2000 nm-thick thermal insulator layer is deposited to create a temperature gradient across the layers. In addition, in this study a new calibration method was used to evaluate the static and dynamic properties of this novel thin film heat flux sensor. The analysis and experimental results show that the heat flux calculated from the sensor output was in good agreement with the value obtained from the pre-calibrated standard sensor. The sensitivity and response time of the novel sensor were measured at 0.06 mV/(kW/m2) and 475 ms, respectively. The heat flux measurements made with the sensor presented good repeatability. The heat-transfer coefficient of the Al2O3 thin film was 4.477 w/(m∙k) for the novel thin film heat flux sensor described in this paper.

show abstract

“…The thermal energy control of aircraft power system is an extremely important technology in the industry (Zribi et al , 2014; Jadhav et al , 2020). The accurate static and transient loading heat flux are acquired by heat flux sensor (HFS), which is installed with high temperature components in the power system, and the parameter is of great significance for guiding the design and health monitoring of high temperature components (Wrbanek and Fralick, 2007a; Frankel, 2012).…”

Section: Introductionmentioning

confidence: 99%

Development of thin film heat flux sensor based on transparent conductive oxide thermopile with antireflective coating

Cui

Sun

et al. 2022

View full text Add to dashboard Cite

Purpose The measurement of heat flux is of importance to the development of aerospace engine as basic physical quantities in extreme environment. Heat radiation is one of the basic forms of heat transfer phenomenon. The structure optimizing can improve the performance and infrared absorptivity of the thin film sensor. Design/methodology/approach This paper designed one kind of thin film heat flux sensor (HFS) with antireflective coating based on transparent conductive oxide thermopile. The introduced membrane structure is so thin that it has little impact on sensor performance. Fabrication of thin film sensors were fabricated by physical vapor deposition (PVD) process. Findings The steady-state and dynamic response characteristics of the HFS were investigated by calibration platform. The experimental results shown that the absorptivity of the membrane structure (for1070nm) improved compared with that before optimization. The sensitivity of heat flux gauge was 48.56 µV/ (kW/m2) and its frequency response was determined to be about 1980 Hz. Originality/value The thin film HFS uses thermopile based on Indium Tin Oxid and In2O3. The antireflective coating is introduced to hot endpoint of HFS to improve sensitivity on laser thermal source. The infrared optical properties of membrane layer structure were investigated. The steady-state and the transient response characteristics of the heat flux sensor were also investigated.

show abstract

Multi-walled carbon nano-tubes for performance enhancement of thin film heat flux sensors

Cited by 8 publications

References 46 publications

Transient heat flux assessment using a platinum thin film sensor for short-duration applications

Transient heat flux assessment using a platinum thin film sensor for short-duration applications

Design and Fabrication of a Thermopile-Based Thin Film Heat Flux Sensor, Using a Lead—Substrate Integration Method

Development of thin film heat flux sensor based on transparent conductive oxide thermopile with antireflective coating

Contact Info

Product

Resources

About