Experimental results for the quasi-steady heat transfer through periodically contacting surfaces

Moses, W. M.; Johnson, Richard R.

doi:10.2514/6.1987-1608

Cited by 10 publications

(9 citation statements)

References 3 publications

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“…This study focused on the effects of contact duration, TCC, thermal conductivity, and thermal diffusivity on the temperature distribution across two contacting surfaces. Moses and Johnson [13] experimentally examined the problem of periodically contacting similar metal surfaces and obtained results that are comparable in both form and magnitude to those of Vick and Ozisik. Moses and Johnson [14] also experimentally examined the approach to the quasi-steady-state condition for similar metallic surfaces in periodic contact, focusing on the behaviour of the TCC during the contact portion of a cycle and on the number of cycles required to reach a quasi-steady state condition.…”

Section: Introductionsupporting

confidence: 70%

“…These results, which are reported by Moses, indicated that, within the accuracy of the recording device, the heat flow down the rod was one-dimensional [13][14]. Table 1 lists the characteristics of the experiment and specimens.…”

Section: Experimental Apparatussupporting

confidence: 64%

“…We consider the actual data taken from a contact conductance experiment conducted by Moses [13][14]. The experimental apparatus, consists of two test cylinders-each held at one end in a thermal reservoir, the supporting frame, and the associated equipment required to bring the test specimens uniformly into and out of contact.…”

Section: Experimental Apparatusmentioning

confidence: 99%

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Inverse heat transfer problem of thermal contact conductance estimation in periodically contacting surfaces

2009

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The problems involving periodic contacting surfaces have different practical applications. An inverse heat conduction problem for estimating the periodic Thermal Contact Conductance (TCC) between one-dimensional, constant property contacting solids has been investigated with conjugate gradient method (CGM) of function estimation. This method converges very rapidly and is not so sensitive to the measurement errors. The advantage of the present method is that no a priori information is needed on the variation of the unknown quantities, since the solution automatically determines the functional form over the specified domain. A simple, straight forward technique is utilized to solve the direct, sensitivity and adjoint problems, in order to overcome the difficulties associated with numerical methods. Two general classes of results, the results obtained by applying inexact simulated measured data and the results obtained by using data taken from an actual experiment are presented. In addition, extrapolation method is applied to obtain actual results. Generally, the present method effectively improves the exact TCC when exact and inexact simulated measurements input to the analysis. Furthermore, the results obtained with CGM and the extrapolation results are in agreement and the little deviations can be negligible.

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Section: Introductionsupporting

confidence: 70%

Section: Experimental Apparatussupporting

confidence: 64%

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Inverse heat transfer problem of thermal contact conductance estimation in periodically contacting surfaces

2009

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“…This study focused on the effects of contact duration, thermal contact conductance, thermal conductivity and thermal diffusivity on the temperature distribution across two contacting surfaces. Moses and Johnson [6] experimentally examined the problem of periodically contacting similar metal surfaces and obtained results that are comparable in both form and magnitude to those of Vick and Ozisik. Moses and Johnson [7] also experimentally examined the approach to the quasisteady-state condition for similar metallic surfaces in periodic contact, focusing on the behavior of the thermal contact conductance during the contact portion of a cycle and on the number of cycles required to reach a quasi-steady state condition.…”

Section: Introductionmentioning

confidence: 70%

A Study of Thermal Contact using Nonlinear System Identification Models

Shojaeefard¹,

Goudarzi²,

Noorpoor³

et al. 2008

American J. of Engineering and Applied Sciences

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Abstract:One interesting application of system identification method is to identify and control the heat transfer from the exhaust valve to the seat to keep away the valve from being damaged. In this study, two co-axial cylindrical specimens are used as exhaust valve and its seat. Using the measured temperatures at different locations of the specimens and with a semi-analytical method, the temperature distribution of the specimens is calculated and consequently, the thermal contact conductance is calculated. By applying the system identification method and having the temperatures at both sides of the contact surface, the temperature transfer function is calculated. With regard to the fact that the thermal contact has nonlinear behavior, two nonlinear black-box models called nonlinear ARX and NLN Hammerstein-Wiener models are taken for accurate estimation. Results show that the NLN Hammerstein-Wiener models with wavelet network nonlinear estimator is the best.

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“…Experiments were conducted using setups that contained two specimens [2,3]. A few numbers of these researches are related to estimation of periodic thermal contact conductance [4][5][6][7][8][9][10]. Components in many rotary devices and in automated processes transfer heat periodically across contact surfaces.…”

Section: Introductionmentioning

confidence: 99%

The Estimation of Time-Varying Thermal Contact Conductance Between Two Fixed Contacting Surfaces

Shojaeefard

Mazidi

Mousapour

2013

mech

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Nomenclature c pspecific heat, J/kgK; e RMSroot mean square error, K; h cthermal contact conductance, W/m 2 K; H-Hilbert space of square-integrable functions; Imaximum number of parameters; kthermal conductivity, W/mK; Llength, m; Nnumber of sensors; qheat flux, W/m 2 ; Sobjective function, K 2 ; ttime, s; t ffinal time, s; Ttemperature, K; T 0-constant temperatures at specimens' end, K; T iinitial temperature, K; Ymeasured temperatures, K; x-Cartesian spatial coordinate. Greek symbols αthermal diffusivity, m 2 /s; δdistance from the interface, m; Δdistance between two sensors, m; ΔTtemperature drop, K; ρdensity, kg/m 3. Subscripts ii-th parameter; jj-th sensor; kk-th sensor.

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Experimental results for the quasi-steady heat transfer through periodically contacting surfaces

Cited by 10 publications

References 3 publications

Inverse heat transfer problem of thermal contact conductance estimation in periodically contacting surfaces

Inverse heat transfer problem of thermal contact conductance estimation in periodically contacting surfaces

A Study of Thermal Contact using Nonlinear System Identification Models

The Estimation of Time-Varying Thermal Contact Conductance Between Two Fixed Contacting Surfaces

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