Fill in the table above. Using heat transfer textbooks (or the internet) find the relationship between the Nusselt number and the Reynolds number for the case studied and compare i... Fill in the table above. Using heat transfer textbooks (or the internet) find the relationship between the Nusselt number and the Reynolds number for the case studied and compare it to the obtained relationship in the lab (state your references). Calculate the heat transfer coefficient for the case studied in the lab using the relationship.
Understand the Problem
The question outlines a laboratory test sheet with various data points and requires the user to fill in the table, find relationships related to the Nusselt number and Reynolds number, and calculate the heat transfer coefficient. It seeks structured information based on experimental data.
Answer
Use Nu = 0.332 Re^0.5 Pr^0.33 for laminar flow; calculate heat transfer coefficient using h = Nu * k / L.
To find the relationship between Nusselt number (Nu) and Reynolds number (Re) for the case studied, you can refer to standard heat transfer correlations. For flow over a flat plate, a common relation is Nu = 0.332 Re^0.5 Pr^0.33 for laminar flow (using applicable Prandtl number, Pr). For turbulent flow, it might be Nu = 0.037 Re^0.8 Pr^0.33. Use these or similar correlations depending on the flow conditions. With the given Re = 815, calculate Nu. The heat transfer coefficient, h, is calculated by rearranging the Nusselt number formula: h = Nu * k / L, where k is thermal conductivity of the fluid and L is the characteristic length.
Answer for screen readers
To find the relationship between Nusselt number (Nu) and Reynolds number (Re) for the case studied, you can refer to standard heat transfer correlations. For flow over a flat plate, a common relation is Nu = 0.332 Re^0.5 Pr^0.33 for laminar flow (using applicable Prandtl number, Pr). For turbulent flow, it might be Nu = 0.037 Re^0.8 Pr^0.33. Use these or similar correlations depending on the flow conditions. With the given Re = 815, calculate Nu. The heat transfer coefficient, h, is calculated by rearranging the Nusselt number formula: h = Nu * k / L, where k is thermal conductivity of the fluid and L is the characteristic length.
More Information
The Nusselt number is crucial for determining convective heat transfer in a system, relating the convective to conductive heat transfer processes.
Tips
Ensure you choose the correct correlation for the type of flow (laminar or turbulent). Misidentifying the flow can lead to incorrect calculations.
Sources
- Heat Transfer in Physics - Omni Calculator - omnicalculator.com
- A Heat Transfer Textbook, 6th edition - MIT - ahtt.mit.edu
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