Influence of Natural Convection on Measurement of Thermal Conductivity with Transient Hot Wire Method
Journal Title: 河南科技大学学报（自然科学版） - Year 2018, Vol 39, Issue 3
Abstract
Based on the test principle of transient hot-wire method, the air heating process of micro-wire ( Φ =0. 06 mm) was measured at horizontal and vertical positions, and the thermal conductivity of air was obtained in different heating powers. The estimation method of air thermal conductivity was adopted considering the influence of natural convection. The calculated value of the thermal conductivity of the estimation method was compared with that of the transient hot wire. The results show that the calculated values of the two methods coincide well when the hot-wire is horizontal placement, but differ greatly from the standard values of the thermal conductivity of air. When the heating power is small, the deviation of the calculated values of the two methods is slightly larger when the micro-wire is vertical placement, and the accuracy of air thermal conductivity calculation based on transient hot-wire method is higher. The deviation of the calculated values of the two methods is small when the heating power is large, and the accuracy of air thermal conductivity calculated by the transient hot-wire method is small. Through theory analysis of natural convection heat transfer intensity on the fine metal wire surface, with the increase of the wire surface temperature, the natural convection heat transfer coefficient of horizontal heating is generally higher than that of vertical heating. The thermal conductivity of transient hot-wire method is affected by the natural convection heat transfer intensity of the heated micro-wire surface.
Authors and Affiliations
Shuwei YANG, Ruijian LIU, Kunfeng LIANG, Moran WANG, Yachao LI
Keywords
Related Articles
- EP ID EP468160
- DOI -
- Views 70
- Downloads 0
Effect of Zinc Doping on Electrochemical Performance of Carbon Coated Lithium Vanadium Phosphate
Li2CO3, V2O5, NH4H2PO4 and ZnO were used as raw material, and glucose was used as carbon source and reductant.Li3V2-xZnx (PO4) 3/C (x = 0, 0.05, 0.10) were fabricated by high-temperature solid state method.By X-ray diffr...
Effect of Electronic Thermostat on Fuel Consumption with Fuzzy PID
Aiming at the problem that the traditional internal combustion engine water temperature control system could not accurately, quickly and steadily adjust the engine water temperature, a fuzzy controller was designed in Si...
Degradation of Rhodamine B Using Divalent Cobalt Ion/Peroxymonosulfate
Divalent cobalt ion [Co (Ⅱ) ] decomposed peroxymonosulfate (PMS) to produce sulfate radical anion (·SO4-) , which was used to break down aqueous rhodamine B.The instantaneous concentration of rhodamine B was detected by...
Analysis of ZigBee Network Performance in Mine Water Inrush Application
Aiming at the reliability of data transmission in Zigbee wireless sensor network in the application of mine water inrush monitoring, the main controller STM32 F107 RB, radio frequency wireless transceiver CC2540 and sens...
Interaction Solutions of Boussinesq-Burgers Equations
With the aid of consistent Riccati expansion method, the Boussinesq-Burgers equations was proved to be consistent Riccati integrable.Some exact interaction solutions of the equations were presented by solving the consist...