How does mass flow affect heat transfer in a PHE system?
Best insight from top research papers
Mass flow rate has a significant impact on heat transfer in a plate heat exchanger (PHE) system. In the study by Zhai and Wu, it was found that the Nusselt number (Nu) and Sherwood number (Sh) increased with Reynolds number (Re) and inlet temperature, but decreased with the inlet concentration . Additionally, the friction factor (f) was found to decrease with Re and inlet temperature, but increase with the inlet concentration . Another study by Lyes et al. showed that the overall conversion efficiency of a thermal/photovoltaic collector increased from 27% to 65% when the mass flow rate varied from 0.02 kg/s to 0.1 kg/s . These findings indicate that higher mass flow rates can enhance heat transfer in PHE systems, leading to improved performance and efficiency.
Answers from top 4 papers
More filters
| Papers (4) | Insight |
|---|---|
4 Citations | The provided paper does not directly discuss the effect of mass flow on heat transfer in a PHE system. |
| The provided paper does not specifically discuss the effect of mass flow on heat transfer in a PHE system. | |
| The provided paper does not mention how mass flow affects heat transfer in a PHE system. | |
5 Citations | The provided paper does not directly address the effect of mass flow on heat transfer in a PHE system. |
Related Questions
How heat transfer works in phase change material systems?5 answersHeat transfer in phase change material (PCM) systems is crucial for efficient energy storage and cooling applications. Various methods have been explored to enhance heat transfer in PCM systems, such as using thermal conductivity enhancers like nanoparticles, spiral metal rings, and triply periodic minimal surface (TPMS) structures. These enhancements aim to improve the rate of heat absorption and release, reducing charging and discharging durations. Nano-encapsulated PCM suspensions have shown promising results by utilizing both sensible and latent heat for enhanced heat transfer. Additionally, modifying the geometry of fins, using carbon additives, and employing metal foams have been studied to increase the heat transfer rate in PCM systems, ultimately improving their overall performance and efficiency.
How does flow condensation affect heat transfer?4 answersFlow condensation affects heat transfer by influencing the condensation heat transfer characteristics. The heat transfer coefficient (HTC) and film thickness are important factors in flow condensation. In mini tubes, interfacial waves can enhance heat transfer through film thinning effects. Propane, a natural refrigerant, has different heat transfer mechanisms in two-phase flow condensation, and its heat transfer coefficients can be accurately predicted using experimental data. Nanopillars in nanochannels can promote condensation performance by disturbing the vapor-liquid interface and increasing heat transfer rates. In the presence of noncondensable gas, a thick boundary layer of condensing vapor is formed near the cooled condenser wall, and the heat transfer rate is inversely proportional to the amount of noncondensable gas and proportional to the vapor flow Reynolds number.
How does the relationship between heat and mass transfer in condensation affect the efficiency of the process?5 answersThe efficiency of the condensation process is influenced by the relationship between heat and mass transfer. In condensation particle counters (CPCs), differential heat and mass transfer rates are controlled by changes in gas composition, which affects the activation efficiency of the instrument. In the context of steam-water injectors, heat and mass transfer in the mixing chamber (MC) are analyzed to determine two-phase flow parameters at the outlet. The condensate mass fraction at the MC outlet is predicted using an empirical correlation based on pressure and temperature measurements. In the case of condensers in air conditioning systems and power plants, heat transfer during condensation is studied to improve the prediction of effective heat transfer coefficients. The thickness of the condensate film and the heat transfer coefficient are affected by the heat flux and the flow conditions in the tube. The Lee model for condensation simulation is improved by considering the interfacial temperature deviation and the thermal conductivity of vapor, resulting in reduced temperature deviation and improved convergence.
How is thermal conductivity important for heat transfer?3 answersThermal conductivity is important for heat transfer because it determines the ability of a material to transmit heat from one place to another. It is a thermophysical property that indicates how well a substance can conduct heat. Understanding the thermal conductivity of materials is crucial in various applications, such as determining good heat conductors and bad heat conductors. In the field of nanofluids, thermal conductivity plays a significant role in enhancing heat transfer. Different thermal conductivity models are used to analyze heat transfer behavior and improve heat transfer rates. The study of heat and mass transfer in magnetohydrodynamic nanofluids also considers thermal conductivity as a variable parameter. Overall, thermal conductivity is a fundamental property that influences the efficiency and effectiveness of heat transfer processes in various systems and materials.
What are the factors that affect the heat transfer in a fishing vessel hold?3 answersFactors that affect heat transfer in a fishing vessel hold include hull design, resistance of appendages, fouling of the hull, machinery, propeller design, and fishing gear and methods. Additionally, the heat released from the engine exhaust gases can be utilized to power an external cooling system onboard, providing efficient refrigeration for the caught fish. The transfer of heat through the hold wall sections can also impact heat leakage through fish hold boundaries, and a finite-difference heat-transfer model has been developed to improve prediction and design curves for wall sections of steel fishing vessels.
What are the main effects of heat transfer in two-phase flow?1 answersHeat transfer in two-phase flow has several main effects. The heat transfer coefficient changes differently for different flow patterns. In bubble flow, the heat transfer coefficient increases with gas volume fraction. In slug flow, the heat transfer coefficient fluctuates largely and decreases as gas volume fraction increases. In annular-mist flow, the heat transfer coefficient rapidly decreases as gas volume fraction increases. The convection heat transfer coefficient is enhanced by a factor of four due to the existence of porous media and by a factor of seven due to the use of micro-pipes. Thermal dispersion caused by fluid mixing enhances heat transfer and must be taken into account for accurate estimations of the exit temperature and total heat transfer rate. Heat transfer in vapor-liquid flows in the region of high reduced pressures is mainly due to the nucleate boiling mechanism, with noticeable enhancement at high vapor quality.