A 2.5 cm sphere is maintained at 50?C in an air stream or a water stream, both
Question:
A 2.5 cm sphere is maintained at 50?C in an air stream or a water stream, both at 20?C and 2 m/s velocity. Compare the rate of heat transfer and the drag on the sphere for both fluids.GIVENA sphere in an air stream or a water streamSphere diameter (D) = 2.5 cm = 0.025 mSphere temperature (Ts) = 50?CFluid temperature (Tf) = 20?CFluid velocity (U??) = 2 m/sASSUMPTIONSRadiation is negligibleFrom Appendix2
Alr or Water Tm 20°C U - 2 m/s D-2.5 cm Water Fluid Air Table Number 13 27 Density at 20°C, p (kg/m) Thermal conductivity at 20°C, k (W/(m K)) Kinematic Viscosity at 20°C, v x 10 (m/s) 998.2 1.164 0.0251 0.597 15.7 1.006 Prandtl number at 20°C, Pr 0.71 7.0 x 10 ((Ns)/m?) x 10° ((Ns)/m²) Absolute viscosity at 20°C, 18.240 993 Absolute viscosity at 50°C, 19.515 555.1
Step by Step Answer:
The Reynolds number is For air For water Equation 711 can be applied to both case...View the full answer
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
Related Video
Density helps us predict whether something will float. Density is super important to consider when building things like ships and submarines. The experiment in the video examines the water density by comparing a glass of water containing sugar with a simple glass of water
Students also viewed these Mechanical Engineering questions
-
Compare the rate of heat transfer and the pressure drop for an in-line and a staggered arrangement of a tube bank consisting of 300 tubes, 6 ft long and 1 in. OD. The tubes are to be arranged in 15...
-
The rate of heat transfer to the surroundings from a person at rest is about 400 kJ/h. Suppose that the ventilation system fails in an auditorium containing 100 people. Assume the energy goes into...
-
A long, half-round cylinder is placed in an air stream with its flat face down-stream. An electrical resistance heater inside the cylinder maintains the cylinder surface temperature at 50?C. The...
-
Demand-pull inflation occurs because the government prints more (more/less) money in the economy. Consumers then Demand more equilibrium quantity (Q*) of each good increase (increase/decrease)...
-
The following differential equation describes the steady state concentration of a substance that reacts with first-order kinetics in an axially-dispersed plug-flow reactor Where D = the dispersion...
-
Marin Company produces two software products ( Cloud - X and Cloud - Y ) in two separate departments ( A and B ) . These products are highly regarded network maintenance programs. Cloud - X is used...
-
The data in Table B. 5 present the performance of a chemical process as a function of several controllable process variables. a. Fit a multiple regression model relating $\mathrm{CO}_{2}$ product...
-
For each of the following companies, specify whether each company would be more likely to use job costing or process costing. a. Aircraft builder b. Hospital c. Cement plant d. Dentist e. Advertising...
-
How do strategic planners integrate ethical considerations and sustainability imperatives into strategic planning processes, balancing short-term financial objectives with long-term societal and...
-
For each pair of atomic sentences, give the most general unifier if it exists: a. P(A, B, B), P(x, y, z). b. Q(y, G (A, B)), Q (G(x, x), y) c. Older (Father (y), y), Older (Father(x), John). d. Knows...
-
A hot-wire anemometer consists of a 5 m diameter platinum wire, 5 mm long. The probe is operated at constant current of 0.03 amp. The electrical resistivity of platinum is 17Wcm at 20C and increases...
-
Compare the effect of forced convection on heat transfer from an incandescent lamp, Problem 5.27. What will the glass temperature be for air velocities of 0.5, 1, 2, and 4 m/s? From Problem 5.27:...
-
The Mutual Assurance and Life Company is offering an insurance policy under either of the following two terms: a. Make a series of twelve $1,200 payments at the beginning of each of the next 12 years...
-
Siyanqoba Trade Union is in negotiations with DD Manufacturers about a wage increase. The parties fail to agree, and the matter is referred to the CCMA for conciliation. After two weeks the matter is...
-
Discuss the relationship of quality assurance (QA) activities with quality control (QC) activities in the construction process. Discuss the roles and responsibilities of the parties in relation to...
-
How information technology, specifically ERP systems, impact operations and supply chain management activities. In this current age of technology we encounter new types of technology or new...
-
1.Define the research problem and 4-6 establish research objectives. 2.Determine the sources of information to fulfill the research objectives 3.Consider the costs and benefits of the research effort.
-
Employees are often the first line of defense when it comes to cyber security - why is it important to keep messaging and responsibilities simple? In what ways can training and awareness become "too...
-
An investor wishes to invest \(\$ 1,000\) and is examining two investment prospects. The net dollar return per dollar invested in the two projects can be represented as the outcome of a bivariate...
-
Chao, Louis, and Mari, unrelated individuals, own all of the shares of Cerise Corporation. All three shareholders have been active in the management of Cerise since its inception. In the current...
-
Show that if periods T 1 and T 2 of two periodic functions v 1 (t) and v 2 (t) have a common multiple, the sum of the two functions, v(t) = v 1 (t) + v 2 (t), is periodic with a period equal to the...
-
The inner and outer surface temperatures of a glass window 5 mm thick are 15 and 5e. What is the heat loss through a window that is 1 m by 3 m on a side? The thermal conductivity of glass is 1.4 W/m....
-
A glass window of width W = 1 m and height H = 2 m is 5 mm thick and has a thermal conductivity of kg = 1.4 W/m. K if the inner and outer surface temperatures of the glass are 15C and -20e,...
-
A freezer compartment consists of a cubical cavity that is 2 m on a side. Assume the bottom to be perfectly insulated. What is the minimum thickness of Styrofoam insulation (k = 0.030 W/m. K) that...
-
Write a short report on a (recent) development that affects the audit market, the audit profession and audit quality. In this report, you are asked to 1) Briefly describe the development and its link...
-
How do cutting-edge technologies such as artificial intelligence and blockchain facilitate organizational flexibility, enabling dynamic resource allocation, process optimization, and rapid...
-
How can individuals cultivate cognitive flexibility and emotional resilience amidst the complexities of modern life, navigating intricate personal and professional dynamics to thrive in rapidly...
Study smarter with the SolutionInn App