Global analysis and development of a predictive tool of the effect of tube inclination on two-phase heat transfer: Boiling, condensation and heated gas-liquid flows

Viscito, Luca; Lips, Stéphane; Revellin, Rémi

doi:10.1016/j.applthermaleng.2019.114300

Cited by 7 publications

(4 citation statements)

References 56 publications

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“…Consistent with the previous diagrams, although The inner wall heat flux profiles in the metal tube for the three considered zones and the two models are shown in Figure 9a,b, respectively. It is worth noting that the 1-D solution provided a uniform heat flux at both the outer and inner surfaces of the heated tube, as specified by Equations (8) and (13). The 2-D model, however, used a more realistic hypothesis of only external heat flux uniformity due to the imposed electrical heating, and the inner value changed continuously (see Figure 9a) according to the temperature field, as in Equation (17).…”

Section: Results Comparisonmentioning

confidence: 99%

“…A comprehensive amount of scientific research has already been carried out to investigate the boiling performance of new low-global warming potential (GWP) refrigerants by testing a wide range of fluids [7][8][9][10][11], tube geometries [12], channel orientations [13], and operating conditions [14]. In these works, different data analysis methods were independently proposed according to, for instance, the measurement instrumentation at disposal and the tube heating method.…”

Section: Introductionmentioning

confidence: 99%

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Peripheral Heat Transfer Coefficient during Flow Boiling: Comparison between 2-D and 1-D Data Reduction and Discussion about Their Applicability

Mastrullo

Mauro

2019

Energies

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This paper presents a critical analysis of possible data reduction procedures for the evaluation of local heat transfer coefficient during flow boiling experiments. The benchmark method using one-dimensional (1-D) heat transfer in a heated tube was compared to a new data reduction method in which both radial and circumferential contributions to the conductive heat transfer inside a metal tube are considered. Using published experimental flow boiling data, the circumferential profiles of the wall superheat, inner wall heat flux, and heat transfer coefficients were independently calculated with the two data reduction procedures. The differences between the two methods were then examined according to the different heat transfer behavior observed (symmetric or asymmetric), which in turn was related to the two-phase flow regimes occurring in a channel during evaporation. A statistical analysis using the mean absolute percentage error (MAPE) index was then performed for a database of 417 collected flow boiling data taken under different operating conditions in terms of working fluid, saturation temperature, mass velocity, vapor quality, and imposed heat flux. Results showed that the maximum deviations between the two methods could reach up to 130% in the case of asymmetric heat transfer. Finally, the possible uses of the two data reduction methods are discussed, pointing out that the two-dimensional (2-D) model is the most reliable method to be employed in the case of high-level modeling of two-phase flow or advanced design of heat exchangers and heat spreader systems.

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Section: Results Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Peripheral Heat Transfer Coefficient during Flow Boiling: Comparison between 2-D and 1-D Data Reduction and Discussion about Their Applicability

Mastrullo

Mauro

2019

Energies

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“…This was due to their relevance to the available configurations in the heating, ventilation and air-conditioning systems, process and chemical industries, thermal plants, etc. In this regard, various models were formulated for both horizontal [ [1], [2], [3], [4], [5], [6]] and vertical flows [ [7], [8], [9], [10]], with very limited studies on inclined flows [ [11], [12], [13], [14]].…”

Section: Introductionmentioning

confidence: 99%

An improved heat transfer correlation for condensation inside inclined smooth tubes

Adelaja

Ewim

Dirker

et al. 2020

International Communications in Heat and Mass Transfer

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“…Viscito et al [23] presented a global analysis of the effect of the channel orientation on the two-phase heat transfer coefficient. The study was implemented by collecting 5408 data points from independently published works, which included flow boiling, flow condensation, and heated gas-liquid flows at various orientations with respect to the gravity force.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Gravity on the Pressure Drop and Heat Transfer Characteristics of Steam in Microchannels: An Experimental Study

2020

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Experiments were carried out to investigate the pressure drop and heat transfer behaviors of a microchannel condenser. The effects of gravity on the condensation of steam in the microchannels were investigated for both horizontal and vertical cases. For the experimental results, the pressure drop of vertical microchannels in the condenser is lower than for horizontal microchannels. In the case of the horizontal microchannel, as the mass flow rate of steam increases from 0.01 g·s−1 to 0.06 g·s−1, the pressure drop increases from 1.5 kPa to 50 kPa, respectively. While the mass flow rate of steam in the vertical microchannel case increases from 0.01 g·s−1 to 0.06 g·s−1, the pressure drop increases from 2.0 kPa to 44 kPa, respectively. This clearly indicates that the gravitational acceleration affects the pressure drop. The pressure drop of the vertical microchannel is lower than that obtained from the horizontal microchannel. In addition, the capacity of the condenser is the same in both cases. This leads to the performance index obtained from the vertical microchannel condenser being higher than that obtained from the horizontal microchannel condenser. These results are important contributions to the research on the condensation of steam in microchannels.

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Global analysis and development of a predictive tool of the effect of tube inclination on two-phase heat transfer: Boiling, condensation and heated gas-liquid flows

Cited by 7 publications

References 56 publications

Peripheral Heat Transfer Coefficient during Flow Boiling: Comparison between 2-D and 1-D Data Reduction and Discussion about Their Applicability

Peripheral Heat Transfer Coefficient during Flow Boiling: Comparison between 2-D and 1-D Data Reduction and Discussion about Their Applicability

An improved heat transfer correlation for condensation inside inclined smooth tubes

The Effects of Gravity on the Pressure Drop and Heat Transfer Characteristics of Steam in Microchannels: An Experimental Study

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