Answer / venkatesh n

nusselt number quantifies how much the convection heat transfer could be higher when compared with the conduction heat transfer, if the fluid were stationary.
biot number provides a way to compare the conduction resistance within a solid body to the convection resistance external to that body (offered by the surrounding fluid) for heat transfer.

Answer / shashank

biot number is used In partial unsteady state heat transfer and it is the ratioof conduction resistance of that body and external convention resistance of fluid.....( means when a solid body is surrounded by a fluid )

where as nussult no corresponds to fluid ie fluid layer which is just near the solid body ( assume pipe ) acts as solid and type of heat transfer is conduction here..... and above this fluid layer convention is taking place....
nussult no is the ratio of this conduction resistance of FLUID to convention t resistance of FLUID....

Answer / chemical engineer

it differs only in characterisic length u take..

hi, i have completed B.tech Chemical enggneering, plz can anyone provide me GVK BIO company's interview questions. iam attending the interview for the first time..

0 Answers  

---

What is gibbs free energy?

0 Answers  

---

ACCOUNTING AND FINANCIAL ENGINEERING - EXAMPLE 34.26 : In a construction accounting for a biochemical processing plant, $A has been spent to date, and another $B is expected required to complete the construction project. The biochemical processing plant is expected to generate a total revenue of $C. Calculate the : (a) estimated total costs; (b) percentage completion of project; (c) total estimated profit; (d) profit to date.

1 Answers  

---

Question 40 - A stream with volumetric flow rate Q enters a cylindrical tank and a stream with volumetric flow rate q exits the tank. The fluid has a constant heat capacity and density. There is no temperature change or chemical reaction occurring in the tank. Develop a model for determining the height of the tank, h. Let V is the volume, A is the cross sectional area, r is the density, m is the mass, where V and A are for the tank, r and m are for the fluid. The rate of mass of fluid accumulation, dm / dt = (Q - q) r. Prove the model to be dh / dt = (Q - q) / A.

1 Answers  

---

Explain how can you keep our seawater used for heat rejection clean before entering our heat exchangers?

0 Answers  

---

when liquid stored in spherical vessel,equilibrium shift towards liquid.what is the benefit of it?

1 Answers  

---

Explain the different types of equipments for the conveyance of solids?

0 Answers  

---

What is the method of determining maximum differential pressure during hydro testing of shell and tube heat exchangers?

0 Answers  

---

What are the assumptions made for kynch theory?

0 Answers  

---

what is difference between urea and NPK fertiliser?

2 Answers  

---

X is strong but has a very low density (1% of traditional earth materials.) and hence light weight. It is a recyclable material. The compression behaviour of X is strain rate dependent. Higher strain rates result in higher initial modulus and higher compression strength. It can also withstand unlimited number of cycling loading provided the repetitive loads are kept below 80% of the compressive strength. The internal structure of the material includes air-traps which make it poor heat conductor. X is non- biodegradable and chemically inert in both soil and water. Most acids and their water solutions do not attack it; however strong oxidizing acids do. Solvents which attack X include esters, ketones, ethers, aromatic and aliphatic hydrocarbons and their emulsions, among others. It does not support bacterial/fungal growth as well .It also has significant acoustic properties and effectively reduces the transmission of airborne sound. X is combustible and should not be exposed to open flame or other ignition sources. Combustion products are carbon monoxide, carbon dioxide, water and soot. Long-term exposure to sunlight causes yellowing and a slight embrittlement of the surface due to ultraviolet light. X is able to withstand the rigours of temperature cycling, assuring long-term performance.

0 Answers   Ford,

---

Define octane number?

0 Answers  

---