Estimation local convective boiling heat transfer coefficient in mini channel

Farahani, Somayeh Davoodabadi; Kowsary, Farshad

doi:10.1016/j.icheatmasstransfer.2011.11.007

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…In this experiment, the temperature sensors were located at y = E − 0.5 mm due to the precision of the machining equipment. In IHCP (Farahani & Kowsary, 2012, a small-time step causes an increase in the variance error, and a very large time step increases the bias error. We are looking for a suitable time step that the RMS error is low, and we can reach more details about the unknown parameter over time.…”

Section: Problem Descriptionmentioning

confidence: 99%

Experimental estimation of temporal and spatial resolution of coefficient of heat transfer in a channel using inverse heat transfer method

Karami

Farahani

Kowsary

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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In this research, a novel method to investigate the transient heat transfer coefficient in a channel is proposed, in which the water flow, itself, is considered both single-phase and two-phase. The experiments were designed to predict the temporal and spatial resolution of the Nusselt number. The inverse technique method is non-intrusive, in which time history of temperature is measured, using some thermocouples within the wall to provide input data for the inverse algorithm. The Tikhonov method is used as an inverse method. Error for estimation heat flux is around 0.06q mean. The temporal and spatial changes of heat flux, Nusselt number, vapor quality, convection number, and boiling number have all been estimated, showing that the estimated local Nusselt numbers of flow for without and with phase change are close to those predicted previously. This study suggests that the extended inverse technique can be successfully utilized to calculate the local time-dependent heat transfer coefficient of boiling flow.

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Section: Problem Descriptionmentioning

confidence: 99%

Experimental estimation of temporal and spatial resolution of coefficient of heat transfer in a channel using inverse heat transfer method

Karami

Farahani

Kowsary

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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show abstract

“…In this experiment, the temperature sensors were located at 𝑦 = 𝐸 − 0.5𝑚𝑚 due to the precision of the machining equipment. In IHCP [21][22], a small time step causes an increase in the variance error and a very large time step increases the bias error. We are looking for a suitable time step that the RMS error is low and we can reach more details about the unknown parameter over time.…”

Section: Figure 3 Inverse Algorithmmentioning

confidence: 99%

“…One of the regularization methods [20] is the conjugate gradient method. Farahani and Kowsary [21] estimated local Nusselt number in mini-channel numerically, utilizing the inverse technique. Giedt [22] investigated variations in the Nusselt number of the airflow perpendicular to a cylinder using an inverse technique.…”

Section: Introductionmentioning

confidence: 99%

Experimental Estimation of Temporal and Spatial Resolution of Coefficient of Heat Transfer in a Channel Using Inverse Heat Transfer Method

Karami

Farahani

Kowsary

et al. 2019

Preprint

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In this research, a novel method to investigation the transient heat transfer coefficient in a channel is suggested experimentally, in which the water flow, itself, is considered both just liquid phase and liquidvapor phase. The experiments were designed to predict the temporal and spatial resolution of Nusselt number. The inverse technique method is non-intrusive, in which time history of temperature is measured, using some thermocouples within the wall to provide input data for the inverse algorithm. The conjugate gradient method is used mostly as an inverse method. The temporal and spatial changes of heat flux, Nusselt number, vapor quality, convection number, and boiling number have all been estimated, showing that the estimated local Nusselt numbers of flow for without and with phase change are close to those predicted from the correlations of Churchill and Ozoe (1973) and Kandlikar (1990), respectively. This study suggests that the extended inverse technique can be successfully utilized to calculate the local time-dependent heat transfer coefficient of boiling flow.

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“…It was concluded that they developed correlation can predict 93.5% of water data and 95.9% of non-aqueous data in the range of ± 30%. Farahani and Kowsary [42] numerically studied in order to determine local convective boiling heat transfer of pure water and nanofluid for transient and steady state conditions. In the study, water/copper mixture having concentration of 5, 10 and 50 mg/L was considered as nanofluids.…”

Section: Introductionmentioning

confidence: 99%

A Review of Flow Boiling in Mini and Microchannel for Enhanced Geometries

Dalkılıç¹

2018

Journal of Thermal Engineering

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Flow boiling researches in enhanced geometries practiced recently have been summarized in this review. Classical approximations in macroscale flows have not applied to the flows with small hydraulic diameters, so, this subject has been paid attention by the researchers. Application areas of these structures are increasing continuously due to cooling need in small confined spaces. The related studies have been reviewed in a chronological manner and their parameters have been given in a table in order for the researchers to observe the scientific duration regarding the progresses on this subject. Almost all papers on this subject have been produced after 2000, therefore, this subject is considered as an actual one to improve and worth to study in the literature. This study can not only be evaluated as the beginning argument for the researchers involved in flow boiling process in mini and microchannel, but it also consists of new works on the investigated subject.

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Estimation local convective boiling heat transfer coefficient in mini channel

Cited by 12 publications

References 19 publications

Experimental estimation of temporal and spatial resolution of coefficient of heat transfer in a channel using inverse heat transfer method

Experimental estimation of temporal and spatial resolution of coefficient of heat transfer in a channel using inverse heat transfer method

Experimental Estimation of Temporal and Spatial Resolution of Coefficient of Heat Transfer in a Channel Using Inverse Heat Transfer Method

A Review of Flow Boiling in Mini and Microchannel for Enhanced Geometries

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