Numerical evaluation of the convective and radiative heat transfer coefficients for preterm neonate body segments inside an incubator

Hannouch, Aziza; Habchi, Charbel; Lemenand, Thierry; Khoury, Khalil El

doi:10.1016/j.buildenv.2020.107085

Cited by 16 publications

(11 citation statements)

References 42 publications

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“…The wind speed and direction had a noticeable influence on h c when wind speed was above 0.2 m/s. When wind speed was below 0.2 m/s, the overall h c was about 4.14 W/m 2 ·K for all wind directions, close to the measurements of Hannouch et al 13 (about 4.54 W/m 2 ·K) and Museux et al 39 (about 4.12 W/m 2 ·K). Compared with adults, it was approximately 2 W/m 2 ·K higher than that of a supine adult measured by Kurazumi et al 40 When wind speed increased, h c increased at varied rates.…”

Section: Discussionsupporting

confidence: 88%

“…Recently, computational fluid dynamics (CFD) techniques have become an essential tool in predicting thermal comfort, with the ability to economically and quickly characterize the temperature and velocity fields and heat transfer coefficient without experimental measurements. Based on CFD simulations, the underlying mechanism of heat transfer from an infant under varied environmental conditions has been further analyzed 10–14 …”

Section: Introductionmentioning

confidence: 99%

“…It was found that the heat loss for facing sideways was always lower than that for facing upward, whether a baby was in a supine or prone position. Nevertheless, an infant in the supine position with arms by the sides was often employed in most previous studies 10,11,13 . The h c for different infant sleeping postures was not well investigated until now.…”

Section: Introductionmentioning

confidence: 99%

“…Based on CFD simulations, the underlying mechanism of heat transfer from an infant under varied environmental conditions has been further analyzed. [10][11][12][13][14] In CFD-based research on infants' thermal comfort, airflow pattern has drawn significant interest because it greatly alters the heat transfer from infants. An appropriate turbulence model contributes to a better understanding of airflow structure and its impacts on heat transfer.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the convective heat transfer coefficient for a sleeping infant in a ventilation room

Jiang

Zhang

2022

Indoor Air

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This study aimed to investigate the influence of wind speed and direction on the convective heat transfer from a sleeping infant in different postures. A computational fluid dynamics (CFD) model of a virtual infant manikin with realistic dimensions was developed to obtain the convective heat transfer coefficient (hc) at the body surface and the airflow and temperature distributions. The numerical model was validated beforehand using experimental data collected from infant thermal manikin experiments. The simulation results revealed that the infant's whole‐body hc increased from 4.00 to 15.73 W/m2·K when wind speed varied from 0.12 to 1 m/s. Infants lost heat more quickly than adults under ventilation, with about 2 W/m2·K higher hc than adults in still air, and the discrepancy widened as the wind speed increased. Wind from the floor generated the highest hc, approximately 66.4% greater than the wind from the feet at 1 m/s wind speed. Considering the wind from the feet caused the most evenly distributed hc, ventilation equipment was suggested to be placed on the side of the infant's feet to reduce local discomfort. Based on the simulation results, empirical models of hc were developed, which lay a solid theoretical foundation for further study on the interaction between infants and environments.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the convective heat transfer coefficient for a sleeping infant in a ventilation room

Jiang

Zhang

2022

Indoor Air

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“…There are various numerical and experimental studies that have been carried out on anthropomorphic infant manikins to estimate the convective and radiative heat transfer coefficients with respect to infant weight, infant gesture, gestation age, and surrounding temperature in the incubator 10‐12 . In an experimental study, Ishigaki et al 13 established the correlation of heat transfer coefficient for free, forced, and mixed convection flow by considering comparable cylindrical and spherical segments as a human body.…”

Section: Introductionmentioning

confidence: 99%

Numerical assessment of heat transfer coefficient for preterm infant nursed under a radiant warmer

2021

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Body heat loss management is the primary concern with respect to a newborn, as excess heat loss or gain leads to hypo‐ or hyperthermia, respectively. The aim of this article is to numerically investigate the convection and radiation heat transfer coefficient of a newborn nursed under a radiant warmer. The preterm neonate manikin has five body segments (head, trunk, leg, arms, and back) placed in a relaxed spine position. In the present study, numerical simulations are carried out for body temperature ranging between 32.5°C and 40.1°C. Ambient air temperature is chosen from 22.77°C to 30°C as preferred room temperature in the analysis. Airflow and heat transfer under the radiant warmer are analyzed in two operational modes, that is, power‐off and power‐on modes. In the power‐on mode, the convective heat transfer coefficient varies between 1.45 and 4.06 W/m2 K, whereas the radiative heat transfer coefficient varies between 0.08 and 3.28 W/m2 K under various operating conditions. The results obtained are numerically validated and found to be in fair agreement with the experimental results available in the open literature.

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Investigation of Heat Loss by Radiation and Convective from External Surface of Airport Buildings

Kon

Caner²

2022

Progress in Sustainable Aviation

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Numerical evaluation of the convective and radiative heat transfer coefficients for preterm neonate body segments inside an incubator

Cited by 16 publications

References 42 publications

Numerical investigation of the convective heat transfer coefficient for a sleeping infant in a ventilation room

Numerical investigation of the convective heat transfer coefficient for a sleeping infant in a ventilation room

Numerical assessment of heat transfer coefficient for preterm infant nursed under a radiant warmer

Investigation of Heat Loss by Radiation and Convective from External Surface of Airport Buildings

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