An experimental investigation of using carbon foam–PCM–MWCNTs composite materials for thermal management of electronic devices under pulsed power modes

Alshaer, W.G.; Rady, Mohamed; Nada, S.A.; Barrio, Elena Palomo del; Sommier, Alain

doi:10.1007/s00231-016-1815-4

Cited by 58 publications

(20 citation statements)

References 14 publications

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“…For convenience, we can rewrite eqn (6) as N C c C = lN w c w . Taking T C and T w from the simulations and c w as a known constant, the graphene heat capacity c C and the ratio l are calculated for each simulation and the results of c C are listed in Table 1.…”

Section: Heat Transfer From Directly Heated Graphenementioning

confidence: 99%

“…The calculated k w values are listed in the last column of Table 1. The numbers in the Table 1 Graphene-water contact resistance calculated using graphene as a heat source or using graphene as a heat transfer medium 13.9(6) Â 10 À8 7.752(3) Â 10 6 12.90(1) Â 10 À8 129.1(4) Â 10 6 0.387(1) Â 10 À8 0.89 (7) Note: values in the parentheses represent the standard deviations of the last digits. Other related calculation data are given in Tables S1-S3 (ESI).…”

Section: Heat Transfer Across Single-layer Graphenementioning

confidence: 99%

“…The equilibrium structures strongly depend on the CNT diameter. In CNT (6,6) and CNT(7,7), the narrow tube diameters only allow water molecules to align on the central axis. In CNT (8,8) and CNT (9,9), the diameters are larger allowing water molecules to form a 'ring' structure, resulting in a larger in-tube water number density.…”

Section: Equilibrium Structures and Density Profilesmentioning

confidence: 99%

“…[2][3][4][5] Additionally, the phase equilibrium can be altered in favor of heat storage applications. 6,7 It seems that the specific improvement of heat transfer depends not only on the PCM itself, but also on the size, shape, or even the oxidation of the graphene-based structures. 8,9 To further replicate the preliminary success, a more in-depth understanding of the nano-scale carbon-PCM interaction and heat transfer is therefore indispensable.…”

Section: Introductionmentioning

confidence: 99%

“…Â 10 À8 2.197(1) Â 10 6 45.52(2) Â 10 À8 95.0(3) Â 10 6 0.526(2) Â 10 À8 0.Â 10 À8 7.851(3) Â 106 12.73(1) Â 10 À8 141.6(5) Â 10 6 0.353(1) Â 10 À8 0.…”

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Cross-plane heat transfer through single-layer carbon structures

Zhang

Nedea

Rindt

et al. 2016

Phys. Chem. Chem. Phys.

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Graphene-based nano-structures have been recently proposed to function as additives to improve the conductivity of thermally sluggish phase change materials (PCMs). Based on the existing research studies, the improvement is dependent not only on the matrix material, but also on the geometry of the carbon structure. To gain more insight into the nano-scale thermal transport problem, we launched the current pilot research using water as the matrix material, to represent the hydroxyl-group-rich sugar alcohols as PCMs. We have found that the heat conduction across a graphene layer to water is much faster than the heat conduction to the graphene layer itself. Also, the high graphene-water thermal contact resistance fails to acknowledge the fast thermal kinetics of the low frequency phonons. In the investigation of the geometry effect, the cross-plane heat transfer coefficient is found to decrease with decreasing CNT diameter except CNT(9,9).

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Section: Heat Transfer From Directly Heated Graphenementioning

confidence: 99%

Section: Heat Transfer Across Single-layer Graphenementioning

confidence: 99%

Section: Equilibrium Structures and Density Profilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Â 10 À8 2.197(1) Â 10 6 45.52(2) Â 10 À8 95.0(3) Â 10 6 0.526(2) Â 10 À8 0.Â 10 À8 7.851(3) Â 106 12.73(1) Â 10 À8 141.6(5) Â 10 6 0.353(1) Â 10 À8 0.…”

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Cross-plane heat transfer through single-layer carbon structures

Zhang

Nedea

Rindt

et al. 2016

Phys. Chem. Chem. Phys.

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Effect of phase change material plates' arrangements on charging and discharging of energy storage in building air free cooling

2020

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Previous examinations of building air free cooling using phase change material (PCM) plates were numerically conducted for specific arrangements/configurations of PCMs plates. Experimental investigation for models validations and comparison between the different configurations of PCMs are the shortages of these studies. The present research experimentally investigates the effects of the PCM plate's arrangements on the thermal characteristics of the charging and discharging processes. Parallel and staggered arrangements of different spaces between the plates were tested. The effect of plates' arrangements on the discharging time and quantity of PCM needed to fulfill the required free cooling are also investigated. The results showed that (a) in parallel arrangement, the discharge time decreases with decreasing spaces between PCM plates; (b) the discharge time in staggered arrangement is longer than that of parallel arrangement by 63%; (c) putting PCM plates on large numbers of rows increases the discharge time; (d) in staggered arrangement, the discharge time increases with decreasing spacing between PCMs plates; (e) the needed quantity of PCMs plates in staggered arrangement is lower than that of parallel arrangement by about 67%; and (f) generally, staggered arrangement with low spaces between PCMs plates is the optimum arrangement for air free cooling as it has the longest discharge time.

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Segregation/cycling effects on thermophysical properties of salt hydrate phase change materials

2021

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Energy storage systems designers normally use the thermophysical properties of phase change materials (PCMs) from the manufactures/suppliers data sheet. Unfortunately, sometimes PCMs systems do not behalf according to supplier data sheet, especially after cycling use. Designing systems based on these unrealistic data sheet make the system operates at off design conditions most of time. The problem is substantially appears in salt hydrates PCMs systems. In this short communication, a case study of such discrepancies in air free cooling is addressed. The system design was based on SP24E PCM data sheet, but results showed that liquids and solidus lines cannot shown on the temperature transient history during charging and discharging process, and complete solidification and melting could not be obtained. For further detailed investigations; differential scanning calorimeter (DSC) tests were conducted for SP24E PCM and completely different results than supplier data sheet were obtained DSC tests showed (a) a wide range of temperature variation during melting and solidifications, (b) phase change starts and ends at lower temperatures compared with supplier data sheet, and (c) phase change latent heat is lower than the one listed in supplier data sheet.

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An experimental investigation of using carbon foam–PCM–MWCNTs composite materials for thermal management of electronic devices under pulsed power modes

Cited by 58 publications

References 14 publications

Cross-plane heat transfer through single-layer carbon structures

Cross-plane heat transfer through single-layer carbon structures

Effect of phase change material plates' arrangements on charging and discharging of energy storage in building air free cooling

Segregation/cycling effects on thermophysical properties of salt hydrate phase change materials

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