Heat transfer across aluminum/stainless-steel surfaces in periodic contact

Moses, W. M.; Dodd, Nicholas

doi:10.2514/3.194

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…(4) with a constant heat flux boundary condition atjc = L dT (7) a solution can be obtained which, when incorporated into Duhamel's method, 9 can be used to solve Eqs. (2)(3)(4)(5).…”

Section: Solution Methodsmentioning

confidence: 98%

Heat transfer analysis of the ungrooved disk of a cooled, multiplate clutch

Weaver

1994

Journal of Thermophysics and Heat Transfer

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A one-dimensional analysis is presented to determine the transient response of a disk due to a time varying heat flux boundary condition. The boundary condition alternates with a step change between a heating flux and a cooling flux which can occur over different time periods (simulating coolant grooves in the adjacent disk). For a multiplate clutch where the driving and reaction disks are of different materials, an approximation of the amount of the heat generated at the sliding interface which enters each disk is presented. Results are given to illustrate the effects of materials, heating and cooling fluxes, and time period on the transient temperature response. Increasing (reducing) the heating (cooling) flux, increasing (reducing) the time period of the heating (cooling) flux, decreasing the disk thickness or increasing the disk thermal diffusivity increases the disk temperature during the clutch engagement period. Nomenclature c = specific heat d 0 , d m , e m = variables in Fourier series approximation to the time-dependent heat flux boundary condition; Eqs. (15), (16), and (17), respectively / = fraction of heat generation at interface which enters disk a h = convection coefficient in coolant channel / 0 , /" = integrals defined in Eq. (10) / = integer from zero to some finite value used in boundary condition; Eq. (4) k = thermal conductivity L = disk thickness m, n = indices of infinite series P N = normal pressure applied to rotating disks q = heat flux q l9 q 2 = heat fluxes in time-dependent boundary condition r = radius or radial direction s = dummy integration variable T = temperature due to a constant boundary condition T = temperature due to a time varying boundary condition T f = fluid temperature Th = temperature due to a constant boundary condition and an initial condition of zero temperature Th' = temperature due to a time varying boundary condition and an initial condition of zero temperature Tj = initial temperature distribution TJ = uniform initial temperature t = timê = time period used in periodic boundary condition x = axial direction a = thermal diffusivity, k/(pc) = function of time used in solution A<£ = angular difference 0 = dimensionless temperature, Th'l(q,Llk) + d 0 at/L 2 \ n = (n7r)IL H s = coefficient of sliding £ = function of x used in solution 77 = numerical constant p = density T = time period used in periodic boundary condition Y = torque per unit area = angular direction if/ -function of x and t used in solution a) = difference between rotational speeds of two disks in sliding contact a*! = angular speed of the reaction disk a) 2 -angular speed of the driving disk Subscripts a = disk defined between x = 0 and x = -L a b = disk defined between x = 0 and x = L h i = initial value 0 = disk defined between x = L and x = 2L

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“…(4) with a constant heat flux boundary condition atjc = L dT (7) a solution can be obtained which, when incorporated into Duhamel's method, 9 can be used to solve Eqs. (2)(3)(4)(5).…”

Section: Solution Methodsmentioning

confidence: 98%

Heat transfer analysis of the ungrooved disk of a cooled, multiplate clutch

Weaver

1994

Journal of Thermophysics and Heat Transfer

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“…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. Dodd and Moses [15] extended this set of experiments to consider periodic contacts between aluminium and stainless steel. Results for this single case of periodic contact between dissimilar metals indicated that the same transient behaviour of the TCC was observed for all metal pairs.…”

Section: Introductionmentioning

confidence: 98%

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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“…However, for dissimilar contact materials, the influence of the material with a lesser thermal conductivity was prevailing. Other studies relating to the TCC between flat surfaces could be found in References [19,20,[22][23][24][25][26][27]. Kumar and Tariq 11,28 investigated the timedependent interfacial heat transfer/TCC between steel-steel conforming (surface) as well as nonconforming (line) contacts under various loadings.…”

Section: Introductionmentioning

confidence: 99%

Steady‐state estimation of thermal contact conductance between sliding disk and stationary cylinder with similar/dissimilar materials under the isothermally heated boundary condition

2021

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An accurate understanding of the thermal contact conductance (TCC) is imperative for the enhancement of the performance and service life of metallic cylindrical joints. However, the evaluation of the TCC between conforming cylindrical solids is quite intricate, as it depends on the temperature, pressure, roughness, relative sliding speed, and thermophysical properties of solids. Instead of generating contacting surfaces stochastically, in this communication, an experimental setup in the lab-scale consisting of a stationary cylinder and a sliding hot disk has been fabricated in which temporal evolutions of the temperature on both solids are recorded by thermocouples. Effects of the disk | 8013

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Heat transfer across aluminum/stainless-steel surfaces in periodic contact

Cited by 10 publications

References 7 publications

Heat transfer analysis of the ungrooved disk of a cooled, multiplate clutch

Heat transfer analysis of the ungrooved disk of a cooled, multiplate clutch

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

Steady‐state estimation of thermal contact conductance between sliding disk and stationary cylinder with similar/dissimilar materials under the isothermally heated boundary condition

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