codeproject vb.net barcode generator The first guess of viscosity is based on the inlet temperature: 1 = 1.36 10 8 exp S1 = 1N R P C in Software

Generate GTIN - 13 in Software The first guess of viscosity is based on the inlet temperature: 1 = 1.36 10 8 exp S1 = 1N R P C

The first guess of viscosity is based on the inlet temperature: 1 = 1.36 10 8 exp S1 = 1N R P C
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1271.6 = 6.72 10 6 reyn 110 + 95
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= 0.336
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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TABLE 19.15 Seireg-Dandage Curve Fits of Raimondi-Boyd Charts: Variable = a
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Sb2 + b3(L/D)
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19.33 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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L TABLE 19.15 Seireg-Dandage Curve Fits of Raimondi-Boyd Charts: Variable = a D (Continued)
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19.34 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
JOURNAL BEARINGS 19.35
JOURNAL BEARINGS
TABLE 19.16 Constants for Use in ViscosityTemperature Equation for Various Oils
From Table 19.15, the appropriate curve-fitted equation for the temperature rise is T = 84.2989 P L J C* D
0.08167
S 0.8554 + 0.08787L/D
Taking = 0.03 pound mass per cubic inch (lbm/in3) and C* = 0.40 Btu/(lbm F) as representative values for lubricating oil, we obtain T1 = 233.33(0.336)0.914 = 86.1 F And so the second estimate of the film mean temperature is Ta2 = 110 + 86.1 = 153.1 F 2
Repeated calculations (13 iterations) produce S = 0.176 = 3.5 10 6 reyn T = 47.7 F
With the Sommerfeld number, the remaining performance parameters are easily calculated. Connors Lubricant Supply Charts. The Raimondi-Boyd lubricant flow and temperature rise data are based on the notion that there is no carryover flow into the active film; that is, Q2 = 0 in Eq. (19.14). From an analogous view, these results are applicable to the situation where Qi >> Q2. Accordingly, Raimondi-Boyd predictions represent fully flooded bearing conditions and yield the coolest running lubricant temperatures for a given set of operating conditions, not accounting for any heat conduction losses. To remedy this and thus provide more realistic design information, Connors [19.9] developed design charts which incorporate the influence of lubricant supply rate on the performance of a full journal bearing for L/D = 1. Figures 19.14 to 19.16 are plots that can be used over the entire range of flows to determine minimum film thickness, friction, and temperature rise from given values of the Sommerfeld number and the inlet flow variable. Example 3. Determine the lubricant temperature rise as a function of the inlet flow rate for the following design parameters:
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JOURNAL BEARINGS 19.36
BEARINGS AND LUBRICATION
FIGURE 19.14 Inlet flow variable versus Sommerfeld number for parametric values of minimum film thickness ratio; L/D = 1, full journal bearing. (From Connors [19.9].)
W = 1500 lbf N = 1800 r/min D = 4 in L = 4 in
C = 4 10 3 in SAE 30 oil Ti = 100 F
Solution. To solve this type of problem, a plot or equation of lubricant viscosity as a function of temperature must be available. The calculation procedure is as follows:
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JOURNAL BEARINGS 19.37
JOURNAL BEARINGS
FIGURE 19.15 Inlet flow variable versus Sommerfeld number for parametric values of friction variable; L/D = 1, full journal bearing. (From Connors [19.9].)
1. 2. 3. 4. 5. 6.
Select a value of Qi /(RCNL). Assume a viscosity value. Compute the Sommerfeld number. Use the Qi /(RCNL) and S values to find J C*(Ta Ti)/P in Fig. 19.16. Calculate the mean film temperature Ta. Increment and repeat the process from step 3 until there are sufficient points to establish an intersection with the lubricant s versus T data. This intersection represents the operating point for the given Qi /(RNCL). 7. Increment the input flow variable, and return to step 2.
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