Obrabotka Metallov / Metal Working and Material ScienceObrabotka Metallov / Metal Working and Material ScienceОбработка металлов (технология • оборудование • инструменты)1994-63092541-819XНовосибирский государственный технический университет30884310.17212/1994-6309-2025-27.3-87-107ArticlesСтатьиResearch ArticleNumerical and experimental investigation of heat transfer augmentation in roughened pipesЧисленное и экспериментальное исследование интенсификации теплообмена в трубах с шероховатой поверхностьюhttps://orcid.org/0000-0001-6190-341257211394793NishandarSiddhanathНишандарСиддханатх
India

Assistant Professor

Доцент

siddhant.nishandar04@gmail.comhttps://orcid.org/0009-0003-0276-899655314868800PiseAshokПайсАшок
India

Ph.D. (Engineering), Professor

канд. техн. наук, профессор

ashokpise@gmail.comhttps://orcid.org/0000-0002-4069-154256194870200AAC-7631-2020BagadePramodkumarБагадеПрамодкумар
India

Ph.D. (Engineering), Professor

канд. техн. наук, профессор

pramodbagade@gmail.comhttps://www.researchgate.net/profile/Pramod-BagadeDepartment of Mechanical Engineering, Government College of Engineering, Karad, Shivaji UniversityКафедра машиностроения, Государственный инженерный колледж Карада, Университет ШиваджиDepartment of Mechanical Engineering, TSSM’s Bhivarabai Sawant College of Engineering and Research (BSCOER)Кафедра машиностроения, Инженерно-исследовательский колледж имени Бхиварабаи Саванта (BSCOER) Общества технической и социальной научной миссии (TSSM)15092025273VOL 27, NO3 (2025)ТОМ 27, №3 (2025)8710710092025Copyright ©; 2025, Nishandar S., Pise A., Bagade P.Copyright ©; 2025, Нишандар С., Пайс А., Багаде П.2025Nishandar S., Pise A., Bagade P.Нишандар С., Пайс А., Багаде П.https://creativecommons.org/licenses/by/4.0https://journals.rcsi.science/1994-6309/article/view/308843

Introduction. In many technical applications, such as thermal energy systems, chemical processing, power production, and HVAC, efficient heat transfer (HT) is essential. Research on improving HT performance in circular pipes is still crucial, especially when it comes to changes that cause thermal boundary layers to be disrupted and turbulence to grow. Purpose of the work: The purpose of this work is to thoroughly examine how convective heat transfer can be improved in circular pipes with purposefully roughened surfaces. It focuses on how surface roughness, flow pulsations, Reynolds number (Re), and heat flow rate (Q) affect thermal performance. Methods of investigation. A combination of experimental and numerical methods is employed to assess the thermo-fluid dynamics inside the pipe. Lab-scale experiments and computational fluid dynamics (CFD) simulations are used to investigate temperature distribution, velocity and pressure fields, turbulent kinetic energy (TKE), vorticity, eddy viscosity, local heat transfer coefficient (h), and Nusselt number (Nu). Additionally, sinusoidal pulsations are introduced at the inlet and the outlet, with regular oscillations in frequency (f) and amplitude (A), over a turbulent flow range (6,753 ≤ Re ≤ 31,000). Results and discussion. The results show that surface roughness enhances HT by significantly increasing turbulence and disrupting the thermal boundary layer. TKE becomes a significant factor when there is a strong correlation between higher HT coefficients and rising turbulence intensity. HT performance is further improved by introducing flow pulsations; downstream pulsation increases Nu by 20–22% and upstream pulsing by 16–19%. The outcomes demonstrate how effectively controlled flow pulsations and surface roughness combine to optimize heat transfer. This collaborative approach holds great potential for compact and highly efficient thermal system designs in industrial environments.

Введение. Эффективный теплообмен (HT) играет важную роль в широком спектре технических приложений, включая системы теплоэнергетики, процессы химической промышленности, энергетическое оборудование и системы HVAC (отопление, вентиляция и кондиционирование воздуха). Повышение эффективности теплообмена в трубах круглого сечения является актуальной задачей, особенно в контексте разработки методов, направленных на интенсификацию турбулентности и модификацию структуры пристенных термических пограничных слоев. Цель работы. Данная работа посвящена комплексному исследованию влияния искусственной шероховатости поверхности труб круглого сечения на интенсификацию конвективного теплообмена. В рамках исследования оценивается влияние шероховатости поверхности, пульсаций потока, числа Рейнольдса (Re) и теплового потока (Q) на теплообменные характеристики. Методы исследования. Для анализа термогидродинамических процессов в трубе применялся комбинированный подход, включающий экспериментальные исследования и методы вычислительной гидродинамики (CFD). Экспериментальные исследования проводились в лабораторных условиях. CFD-моделирование использовалось для детального изучения распределений температуры, полей скорости и давления, турбулентной кинетической энергии (TKE), вихревых структур, коэффициента турбулентной вязкости, локального коэффициента теплоотдачи (h) и числа Нуссельта (Nu). С целью интенсификации теплообмена изучалось воздействие синусоидальных пульсаций, накладываемых на входной и выходной потоки, с варьированием частоты (f) и амплитуды (A) колебаний в диапазоне турбулентного режима течения (6753 ≤ Re ≤ 31 000). Результаты и обсуждение. Установлено, что шероховатость поверхности приводит к увеличению интенсивности теплообмена за счет генерации дополнительной турбулентности и дестабилизации термического пограничного слоя. Подтверждена значимая роль турбулентной кинетической энергии (TKE) в интенсификации теплообмена, проявляющаяся в корреляции между повышенными значениями TKE и увеличением коэффициента теплоотдачи. Показано, что применение пульсаций потока позволяет дополнительно увеличить эффективность теплообмена: введение пульсаций на выходе приводит к увеличению числа Nu на 20–22 %, а на входе – на 16–19 % относительно базового случая (без пульсаций). Полученные результаты демонстрируют перспективность комбинированного использования шероховатой поверхности и контролируемых пульсаций потока для оптимизации процессов теплопередачи. Данный подход может быть эффективно применен при проектировании компактных и высокоэффективных теплообменных аппаратов для различных отраслей промышленности.

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