Effect of Temperature-Dependent Thermophysical Properties on Thermal Regulation in Microvascular Composites

Konsep Inti

The dependence of thermophysical properties, such as thermal conductivity and specific heat capacity, on temperature does not significantly affect the qualitative behavior of active cooling in microvascular composites, but it can slightly impact the quantitative performance.

Abstrak

The content discusses the effect of temperature-dependent material properties on thermal regulation in microvascular composites. It starts by highlighting the importance of understanding how materials respond to changes in temperature, particularly for fiber-reinforced composites (FRCs) and their base constituents. The specific heat capacity and thermal conductivity of these materials can vary with temperature, which is crucial for designing efficient thermal regulation systems.
The paper then introduces a reduced-order mathematical model that describes the steady-state thermal regulation in thin vascular systems, considering temperature-dependent material properties. Using this model, the authors investigate three key questions:

Do the minimum and maximum principles hold for thermal regulation even under temperature-dependent material properties?
How do temperature-dependent material properties affect the two invariants (i.e., mean surface temperature and outlet temperature) under flow reversal?
How does accounting for temperature-dependent material properties affect the active cooling performance quantitatively?

The authors first present the results of thermal characterization experiments, showing the variations in specific heat capacity and thermal conductivity for CFRP, GFRP, and epoxy over the temperature range of 296.15-423.15 K. They then establish the minimum and maximum principles for the steady-state solutions, extending the previously known results for constant material properties to the case of temperature-dependent material properties.
Using numerical simulations, the authors address the last two questions. They find that the temperature-dependent material properties do not significantly influence the qualitative behavior, such as the minimum and maximum principles and the invariance of mean surface temperature and outlet temperature under flow reversal. However, the dependence slightly affects the quantitative results, such as the mean surface temperature and thermal efficiency.
The significance of this work is that it provides a deeper understanding of how vascular-based thermal regulation systems behave in realistic scenarios, where the thermophysical properties of the materials depend on temperature.

Statistik

The specific heat capacity of CFRP, GFRP, and epoxy varies significantly with temperature, as shown by the polynomial fits:
0.01θ + 0.418 (CFRP)
0.012θ^2 - 4.49θ + 1305.3 (GFRP)
0.01θ^2 - 3.79θ + 1293.2 (Epoxy)
The thermal conductivity of CFRP also varies with temperature, as described by the polynomial fit:
0.026θ^2 - 12.868θ + 2941.9
In contrast, the thermal conductivity of GFRP and epoxy remains relatively constant over the temperature range.

Kutipan

None.

Wawasan Utama Disaring Dari

Effect of temperature-dependent material properties on thermal regulation in microvascular composites

by K. Adhikari,... pada arxiv.org 04-02-2024

https://arxiv.org/pdf/2401.03103.pdf

Pertanyaan yang Lebih Dalam

How would the results change if the temperature dependence of the fluid properties (density, specific heat capacity) were also considered

Considering the temperature dependence of the fluid properties, such as density and specific heat capacity, would introduce additional complexities to the thermal regulation model. The variation in fluid properties with temperature would impact the heat transfer characteristics within the system. Specifically, changes in fluid density would affect the convective heat transfer, while alterations in specific heat capacity would influence the amount of heat absorbed or released by the fluid as it flows through the vasculature.
Incorporating the temperature dependence of fluid properties would lead to a more comprehensive and accurate representation of the thermal behavior in the system. The interactions between the temperature-dependent material properties of the solid host and the fluid properties would result in a more nuanced and realistic simulation of the active cooling process. This integration could reveal further insights into the thermal regulation efficiency and the overall performance of the system under varying operating conditions.

What are the potential implications of temperature-dependent material properties on the design and optimization of active cooling systems for microvascular composites

The consideration of temperature-dependent material properties in the design and optimization of active cooling systems for microvascular composites can have significant implications. By accounting for the variations in thermal conductivity and specific heat capacity with temperature, engineers and researchers can develop more precise models that reflect the real-world behavior of the materials. This enhanced understanding can lead to improved thermal management strategies and more efficient cooling mechanisms.
The implications of temperature-dependent material properties extend to the optimization of active cooling systems. By accurately capturing the thermal behavior of the composite materials under different temperature conditions, designers can fine-tune the cooling mechanisms to achieve optimal performance. This optimization may involve adjusting the flow rates, channel geometries, or coolant properties to maximize heat dissipation and minimize thermal gradients within the structure.
Furthermore, the insights gained from studying temperature-dependent material properties can guide the development of advanced thermal regulation techniques for microvascular composites. By leveraging this knowledge, researchers can explore innovative cooling strategies, such as adaptive cooling systems that dynamically adjust based on the changing material properties. Overall, the consideration of temperature-dependent material properties opens up new avenues for enhancing the efficiency and effectiveness of thermal regulation in microvascular composites.

How could the insights from this study be extended to understand the thermal regulation in other types of composite materials or structures beyond microvascular composites

The insights obtained from studying the effects of temperature-dependent material properties on thermal regulation in microvascular composites can be extrapolated to understand thermal behavior in other types of composite materials or structures. By applying similar methodologies and analyses to different composite systems, researchers can investigate how temperature variations impact thermal conductivity, specific heat capacity, and overall heat transfer characteristics in various materials.
For instance, the findings from this study could be extended to explore thermal regulation in composite structures used in aerospace applications, automotive components, or electronic devices. Understanding how temperature-dependent material properties influence heat dissipation and thermal management in these diverse contexts can inform the design and optimization of cooling systems tailored to specific industry requirements.
By broadening the scope of the research to encompass a range of composite materials and structures, researchers can uncover universal principles governing thermal regulation and develop generalized strategies for efficient heat dissipation. This cross-disciplinary approach can lead to advancements in thermal engineering, offering valuable insights for improving the performance and reliability of composite structures across different sectors.