For suitable design of equipment and process optimization, the determination of thermophysical properties of the raw materials is necessary. Therefore, this work was aimed at determining and modeling the density, specific heat, thermal diffusivity, and thermal conductivity of acid slurries of cassava bagasse used during its conversion into bioethanol. Experimental measurements were carried out in slurries with different mass fractions of cassava bagasse (0.00 to 0.10) and phosphoric acid (0.00 to 0.10) at temperatures from 278.13 to 318.13 K. Results obtained show that density varied from 986.5 to 1,029.3 kg∙m⁻³, specific heat from 3,830.0 to 4,142.6 J∙kg⁻¹∙K⁻¹, thermal diffusivity from 0.9624 × 10⁻⁷ to 1.5249 × 10⁻⁷ m²∙s⁻¹ and thermal conductivity from 0.3825 to 0.6212 W∙m⁻¹∙K⁻¹. While density increased with increasing solids and acid content at decreasing temperature, the thermal properties decreased at higher solids and acid content and increased when heating the slurries. The values were well‐fitted to polynomial models with good accuracy (R² > 0.921 and MRE < 1.75%), allowing the application of the models to obtain reliable and ready‐to‐use data for cassava bagasse processing. Thus, the data reported in this study can be used for designing and managing momentum, heat and mass transfer processes for enhancing bioethanol production from cassava bagasse.

中文翻译：

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木薯蔗渣稀酸浆液的热物理性质与生物量，酸浓度和温度的关系

为了进行适当的设备设计和过程优化，必须确定原材料的热物理性质。因此，这项工作旨在确定和建模木薯甘蔗渣转化成生物乙醇过程中使用的酸性木浆的酸浆的密度，比热，热扩散率和热导率。在具有不同质量分数的木薯蔗渣（0.00至0.10）和磷酸（0.00至0.10）的浆料中进行实验测量，温度为278.13至318.13K。获得的结果表明密度在986.5至1,029.3 kg∙m ^{-3之间变化}，比热从3,830.0到4,142.6 J∙kg ^-1 ∙K ^-1，热扩散率从0.9624×10 ^-7到1.5249×10 ^-7m ² ∙s ^-1，导热系数从0.3825至0.6212 W∙m ^-1 ∙K ^-1。尽管在降低的温度下密度随着固体和酸含量的增加而增加，但在较高的固体和酸含量下，热性能下降，而加热浆液时，热性能则增加。该值非常适合高精度的多项式模型（R ²  > 0.921和MRE  <1.75％），从而允许模型的应用获得可靠且易于使用的木薯蔗渣加工数据。因此，本研究报告的数据可用于设计和管理动量，传热和传质过程，以提高木薯蔗渣的生物乙醇产量。