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传递现象

Transport Phenomena

课程介绍 Course Introduction

学分:3 | 先修课:高等数学、大学物理、物理化学 | 学期:大三上

传递现象是化学工程专业的核心课程,统一研究动量传递、热量传递和质量传递的基本规律。内容包括流体动力学(粘性流体流动、层流与湍流、边界层理论)、热量传递(导热、对流传热、辐射传热)、质量传递(分子扩散、对流传质、传质系数),以及三种传递过程之间的类比关系。学生将掌握传递过程的数学建模与求解方法,为后续单元操作课程奠定理论基础。

Transport Phenomena is a core course for chemical engineering majors, unified study of momentum, heat, and mass transfer fundamentals. Topics include fluid dynamics (viscous flow, laminar and turbulent flow, boundary layer theory), heat transfer (conduction, convection, radiation), mass transfer (molecular diffusion, convective mass transfer, mass transfer coefficients), and analogies among the three transport processes. Students master mathematical modeling and solution methods for transport processes, building a theoretical foundation for subsequent unit operations courses.

大作业 Final Project

作业标题:圆管内对流传热传质过程建模与计算 / Convective Heat and Mass Transfer in Tube Modeling and Computation

针对圆管内对流传热传质过程建立数学模型,求解速度、温度与浓度场分布并计算传热与传质系数。分析动量、热量、质量传递的类比关系。

Build a mathematical model for convective heat and mass transfer in a tube, solve velocity, temperature and concentration field distributions and compute heat and mass transfer coefficients. Analyze analogies among momentum, heat and mass transfer.

实施步骤 Implementation Steps

📋 示例:以工业圆管内的对流传热为研究对象,比如石油炼制中原油预热管道的流动与传热。你需要建立速度场、温度场的数学模型,用数值方法求解并计算努塞尔数与摩擦系数,然后对比不同管径和流速下的传热强化效果,给出最优设计参数。
步骤 1
物理模型建立
本步骤是化学工程项目的关键环节,运用化工原理和专业方法解决工艺问题。化学工程强调三传一反规律,每一步都需要严谨的热力学分析和物料能量衡算。采用行业标准方法和专业化工软件确保设计的可靠性和经济性。

• 依据化工设计规范和标准,制定详细的技术方案和计算方法
• 使用专业化工软件(Aspen Plus/PROII/ChemCAD等)进行流程模拟和优化计算
• 进行物料衡算、能量衡算验证,确保结果准确可靠并满足工程要求
产出:化工设计报告(含工艺流程图、物料能量衡算、设备选型、经济分析) | 质量标准:方法规范、数据准确、设计合理、经济可行
步骤 2
边界条件与求解
本步骤进行化工过程的详细计算,获取定量的设计参数和性能指标。计算是化工设计的核心手段,通过物料衡算、能量衡算和设备计算为工艺设计提供定量依据。需严格遵循化工设计规范和标准,确保计算结果准确可靠。

• 确定计算方法和计算公式,明确计算的理论依据和假设条件,绘制计算流程图
• 使用Aspen Plus或PROII进行流程模拟计算,获得物料流股数据和设备参数
• 手动校核关键计算结果,通过经验公式或简化模型交叉验证,确保计算准确
产出:计算书(含计算公式、计算过程、结果数据表、模拟文件、验证对比) | 质量标准:计算方法正确、过程清晰、结果准确、验证充分
步骤 3
场分布分析
本步骤对化工过程进行热力学分析和火用分析,揭示过程的能量利用效率和不可逆损失。火用分析是评估过程能量品质的高级方法,基于热力学第二定律,量化各单元的火用损失,找出能量利用的薄弱环节。为节能改造和工艺优化提供方向性指导。

• 确定环境状态参数(T0、P0),计算各流股的焓、熵和火用值,建立火用衡算方程
• 计算各单元设备的火用损失和火用效率,识别不可逆损失最大的关键设备
• 绘制热集成温焓图(T-H图)和夹点分析,确定最小公用工程用量和节能潜力
产出:火用分析报告(含火用衡算表、各单元火用损失分布图、夹点分析图、节能潜力评估) | 质量标准:火用衡算闭合、损失分布清晰、节能潜力分析合理
步骤 4
传递系数计算
本步骤进行化工过程的详细计算,获取定量的设计参数和性能指标。计算是化工设计的核心手段,通过物料衡算、能量衡算和设备计算为工艺设计提供定量依据。需严格遵循化工设计规范和标准,确保计算结果准确可靠。

• 确定计算方法和计算公式,明确计算的理论依据和假设条件,绘制计算流程图
• 使用Aspen Plus或PROII进行流程模拟计算,获得物料流股数据和设备参数
• 手动校核关键计算结果,通过经验公式或简化模型交叉验证,确保计算准确
产出:计算书(含计算公式、计算过程、结果数据表、模拟文件、验证对比) | 质量标准:计算方法正确、过程清晰、结果准确、验证充分
步骤 5
结果讨论与报告
本步骤是化学工程项目的关键环节,运用化工原理和专业方法解决工艺问题。化学工程强调三传一反规律,每一步都需要严谨的热力学分析和物料能量衡算。采用行业标准方法和专业化工软件确保设计的可靠性和经济性。

• 依据化工设计规范和标准,制定详细的技术方案和计算方法
• 使用专业化工软件(Aspen Plus/PROII/ChemCAD等)进行流程模拟和优化计算
• 进行物料衡算、能量衡算验证,确保结果准确可靠并满足工程要求
产出:化工设计报告(含工艺流程图、物料能量衡算、设备选型、经济分析) | 质量标准:方法规范、数据准确、设计合理、经济可行

Steps

Step 1
Physical Model Setup
This step is a critical element in chemical engineering projects, using chemical engineering principles and professional methods to solve process problems. Chemical engineering emphasizes transport phenomena and reaction engineering, requiring rigorous thermodynamic analysis and material/energy balance at every step. Industry standard methods and professional chemical engineering software are used to ensure design reliability and economics.

• Develop detailed technical solutions and calculation methods according to chemical engineering design specifications and standards
• Use professional chemical engineering software (Aspen Plus/PROII/ChemCAD, etc.) for process simulation and optimization calculations
• Perform material balance and energy balance verification, ensuring results are accurate and reliable and meet engineering requirements
Deliverable: Chemical engineering design report (including process flow diagram, material and energy balance, equipment selection, economic analysis) | Quality standard: Standard methods, accurate data, reasonable design, economically feasible
Step 2
Boundary Conditions and Solution
This step performs detailed calculations of chemical engineering processes, obtaining quantitative design parameters and performance indicators. Calculation is the core means of chemical engineering design, providing quantitative basis for process design through material balance, energy balance and equipment calculation. Must strictly follow chemical engineering design specifications and standards, ensuring accurate and reliable calculation results.

• Determine calculation methods and formulas, clarify theoretical basis and assumptions, draw calculation flow chart
• Perform process simulation calculations using Aspen Plus or PROII, obtain material stream data and equipment parameters
• Manually verify key calculation results, cross-validate through empirical formulas or simplified models, ensuring calculation accuracy
Deliverable: Calculation document (including calculation formulas, calculation process, result data table, simulation files, validation comparison) | Quality standard: Correct calculation method, clear process, accurate results, sufficient verification
Step 3
Field Distribution Analysis
This step performs thermodynamic analysis and exergy analysis of chemical processes, revealing process energy utilization efficiency and irreversible losses. Exergy analysis is an advanced method for evaluating process energy quality, quantifying exergy losses of each unit based on the second law of thermodynamics, identifying weak links in energy utilization. Provides directional guidance for energy-saving retrofitting and process optimization.

• Determine environmental state parameters (T0, P0), calculate enthalpy, entropy and exergy values of each stream, establish exergy balance equations
• Calculate exergy loss and exergy efficiency of each unit equipment, identify key equipment with maximum irreversible loss
• Plot heat integration temperature-enthalpy diagram (T-H diagram) and pinch analysis, determine minimum utility consumption and energy saving potential
Deliverable: Exergy analysis report (including exergy balance table, unit exergy loss distribution diagram, pinch analysis diagram, energy saving potential assessment) | Quality standard: Exergy balance closed, clear loss distribution, reasonable energy saving potential analysis
Step 4
Transfer Coefficient Calculation
This step performs detailed calculations of chemical engineering processes, obtaining quantitative design parameters and performance indicators. Calculation is the core means of chemical engineering design, providing quantitative basis for process design through material balance, energy balance and equipment calculation. Must strictly follow chemical engineering design specifications and standards, ensuring accurate and reliable calculation results.

• Determine calculation methods and formulas, clarify theoretical basis and assumptions, draw calculation flow chart
• Perform process simulation calculations using Aspen Plus or PROII, obtain material stream data and equipment parameters
• Manually verify key calculation results, cross-validate through empirical formulas or simplified models, ensuring calculation accuracy
Deliverable: Calculation document (including calculation formulas, calculation process, result data table, simulation files, validation comparison) | Quality standard: Correct calculation method, clear process, accurate results, sufficient verification
Step 5
Result Discussion and Report
This step is a critical element in chemical engineering projects, using chemical engineering principles and professional methods to solve process problems. Chemical engineering emphasizes transport phenomena and reaction engineering, requiring rigorous thermodynamic analysis and material/energy balance at every step. Industry standard methods and professional chemical engineering software are used to ensure design reliability and economics.

• Develop detailed technical solutions and calculation methods according to chemical engineering design specifications and standards
• Use professional chemical engineering software (Aspen Plus/PROII/ChemCAD, etc.) for process simulation and optimization calculations
• Perform material balance and energy balance verification, ensuring results are accurate and reliable and meet engineering requirements
Deliverable: Chemical engineering design report (including process flow diagram, material and energy balance, equipment selection, economic analysis) | Quality standard: Standard methods, accurate data, reasonable design, economically feasible
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