Local Heat Transfer Coefficient Measurements of Flat Angled Sprays Using Thermal Test Vehicle

Bonner, Richard; Wadell, Robert P.; Popov, G. Ya.

doi:10.1109/stherm.2008.4509382

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…In general, the equations that describe heat transfer in many configurations assume the form shown in equation ( 4) (Bonner et al, 2008). In these equations, the HTC between the bulk of the liquid and the solid surface depends on:…”

Section: Compensation For the Small Variations In Experimental Conditions Using Relative Htcmentioning

confidence: 99%

Measurement and prediction of the heat transfer properties of hydrocarbon mixtures with potential application as aluminum cold rolling base oils

Pattemore

Heenan

Januszkiewicz

2015

Industrial Lubrication and Tribology

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Purpose -The objective of this paper is to measure the differences in heat transfer properties of refined hydrocarbon distillate fractions that are commonly used as base oils in aluminium sheet cold rolling applications and assess if the heat transfer coefficient (HTC) values for these oils can be predicted from their compositions. The composition and physical properties of these fluids affect their tribological behaviour by influencing hydrodynamic lubrication, wear debris removal and cooling. Design/methodology/approach -A purpose-built test rig was used to measure HTCs for a wide range of hydrocarbon solvents used as aluminium cold rolling oils. The results are expressed in the form of the HTCs relative to those of 14-to 16-carbon-chain-length normal paraffins. Measured HTC values were compared to values calculated from oil compositions and from the thermal conductivities of compounds representing different classes of typical oil components. Findings -There were significant differences between the heat transfer properties of various hydrocarbon solvents, and these differences could be estimated from their content of normal and simple iso-paraffins and heavily branched and cyclic hydrocarbons. The HTC of hydrocarbon mixtures increases with the increasing content of n-paraffinic compounds. Originality/value -This paper shows how one can estimate the relative HTCs of oils of known compositions, based on the relative thermal conductivities of model compounds. This is relevant to prediction of cooling properties of aluminium cold rolling base oils.

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Section: Compensation For the Small Variations In Experimental Conditions Using Relative Htcmentioning

confidence: 99%

Measurement and prediction of the heat transfer properties of hydrocarbon mixtures with potential application as aluminum cold rolling base oils

Pattemore

Heenan

Januszkiewicz

2015

Industrial Lubrication and Tribology

View full text Add to dashboard Cite

show abstract

“…For the characterization of the fundamental heat transfer phenomena, uniform heating in the surface is most appropriate since other effects such as thermal spreading in the silicon are minimized. In the real application, however, the heated chip has non-uniform hot spots with peak heat fluxes up to 1000 W/cm 2 over very small areas (<0.25 mm 2 ) [9]. The measurements can either be performed in a mock-up apparatus of the integration of the cooling solution or using a more realistic test vehicle with integrated heaters and temperature sensors, where each approach has its advantages and drawbacks.…”

Section: Introductionmentioning

confidence: 99%

“…Evelyn N. Wang et al [27] used a 1 cm 2 Si thermal test chip with seven calibrated temperature sensors to study the performance of the microjet heat sinks, but the test chip used in the experimental investigations has a low spatial resolution. Richard et al [28] carried out thermal experiments for a flat spray cooling system with nozzles angled to the surface of a silicon chip using only four micro-heaters for delivering peak heat fluxes and 29 RTDs. However, the spatial resolution of the temperature measurement is limited by the number of RTD temperature sensors.…”

Section: Introductionmentioning

confidence: 99%