Download Heat Transfer in Fluidized Beds by O. Molerus, K.E. Wirth PDF
By O. Molerus, K.E. Wirth
This ebook presents a far wanted and thorough therapy of the warmth move in agitated disperse platforms. It supplies predictive equations for the warmth move in relocating beds, effervescent and circulating fluidized beds, pneumatic delivery in vertical tubes and particulate fluidized beds. because of the various various modes of activation of warmth move, the fundamental process of the booklet is to supply experimental facts of the relevance of particle movement to the proximity of good surfaces for the warmth move saw. This has been completed by way of the assessment of experiments received with a newly built pulsed gentle process utilizing luminous debris. warmth move in Fluidized Beds may be of significant use to scholars and researchers considering warmth move and thermodynamics.
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Example text
Larger particles have a greater inertia oc which inhibits particle removal. Therefore, the mean residence times are distinctly longer for the coarser particles. 7 INFLUENCE OF PROBE SIZE ON HEAT TRANSFER COEFFICIENTS MEASURED Several authors, among them Gelperin and Einstein [13], observed a significant influence of probe size on measured heat transfer coefficients. The measured particle velocities parallel to the wall, presented below, provide a plausible explanation for this effect. As shown in Fig.
6 State diagram of particulate fluidization calculated according to Molerus [9]. segregation after the transition to the minimum fluidization velocity Umf. With rather fine-graiped particles, the region close to a vertical solid surface is practically free from ascending gas bubbles, so a more or less undisturbed particle layer can develop. 7 Lateral force under laminar shear flow. 14 Particle migration at solid surfaces fluidization, the approximation V = Umf should hold. 12). 2. 2). 14) provides a clear message.
26) Insignificance of the thermal properties of the solid material results from the fact that with particle sizes dp ;;;. 2 mm, the particle residence times of about 1 s are far too short to heat up the particles significantly. The higher heat transfer coefficients in comparison with those observed in fixed beds result from the fact that quick particle exchange at a hot heat exchanger surface provides rather cool particle surfaces, even close to the heat exchanger surface. 2 provide a clear message.