On selection of reference temperature of heat transfer coefficient for complicated flows

Li, X. C.; Zhou, Jiang; Aung, Kendrick

doi:10.1007/s00231-008-0461-x

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…The adiabatic surface temperature is often used as the reference temperature for complicated flows, as per Li et al [33]. For mist jets, there exists the further issue of which reference fluid temperature to use: the water temperature, as in Fabbri et al [10] or the air temperature as per Tay et al [26].…”

Section: Heat Transfer Measurementsmentioning

confidence: 99%

Heat transfer behaviour of a dilute impinging air-water mist jet at low wall temperatures

Quinn

Murray

Persoons

2017

International Journal of Heat and Mass Transfer

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This paper presents experimental work on the heat transfer characteristics of a dilute impinging air-water mist jet. Time-averaged heat transfer measurements are reported, as well as simultaneously obtained high-speed shadowgraph imaging flow visualisation and heat transfer measurements; images of the mist jet impingement and the liquid film that forms on the impingement surface are also included. It is determined that the surface liquid morphology varies with mist loading fraction, and that the heat transfer behaviour of the mist jet reflects these changes. Intermittent thermal disturbance caused by the impingement of the mist jet droplets is proposed as the dominant heat transfer mechanism when the mist loading fraction is very low; as the mist loading fraction increases, evaporation from the surface liquid film and convective cooling due to the film flow become more significant.

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Section: Heat Transfer Measurementsmentioning

confidence: 99%

Heat transfer behaviour of a dilute impinging air-water mist jet at low wall temperatures

Quinn

Murray

Persoons

2017

International Journal of Heat and Mass Transfer

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“…Adiabatic wall temperature is usually selected as the reference temperature when defining the heat transfer coefficient [15,29],…”

Section: Fluid Reference Temperature Of Double Inletmentioning

confidence: 99%

The Effect of Weak Crossflow on the Heat Transfer Characteristics of Short-Distance Impinging Cooling

Zhang

et al. 2014

Journal of Heat Transfer

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T h e E ffect of W e a k C ro ssflo w on th e H e a t T ra n s fe r C h a ra c te ris tic s of S h o rt-D is ta n c e Im p in g in g C o o lin g This paper numerically and experimentally investigated the effect o f weak crossflow on the heat transfer characteristics o f a short-distance impinging jet. The Reynolds number o f the impinging je t ranged from 6000 to 15,000, and the mass velocity ratio (M) between the crossflow and the je t varied from 0 to 0.15. The separation distance (H) between the exit o f the je t nozzle and the impingement surface equals to the exit diameter (D) o f the impinging jet. In the experiments, the temperature distribution on the impingement target surface was measured using a transient liquid crystal method. In the numerical simula tion, a multiblock hexahedral mesh was applied to discrete the computational domain, and a commercial CFD package (ansys cfx-12.0) with a standard k-s turbulence model was used fo r computation. It was found that compared to the impinging cooling without crossflow, the heat transfer characteristics near the impinging stagnation point remained almost constant. At the same time, the presence o f crossflow decreased the heat transfer rate in the upstream region o f the impinging stagnation point, while increased that in the downstream o f the impinging stagnation point. Taken together, crossflow has a complex influence on the impinging cooling, which is highly dependent on the mass velocity ratio between the crossflow and the jet.

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Uncertainty analysis of adiabatic wall temperature measurements in turbine experiments

Lavagnoli

Maesschalck

Paniagua³

2015

Applied Thermal Engineering

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On selection of reference temperature of heat transfer coefficient for complicated flows

Cited by 8 publications

References 15 publications

Heat transfer behaviour of a dilute impinging air-water mist jet at low wall temperatures

Heat transfer behaviour of a dilute impinging air-water mist jet at low wall temperatures

The Effect of Weak Crossflow on the Heat Transfer Characteristics of Short-Distance Impinging Cooling

Uncertainty analysis of adiabatic wall temperature measurements in turbine experiments

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